diff --git a/webrtc/modules/audio_coding/main/acm2/acm_isac.cc b/webrtc/modules/audio_coding/main/acm2/acm_isac.cc
index 6ee268255..bc20c9616 100644
--- a/webrtc/modules/audio_coding/main/acm2/acm_isac.cc
+++ b/webrtc/modules/audio_coding/main/acm2/acm_isac.cc
@@ -262,8 +262,7 @@ static uint16_t ACMISACFixGetDecSampRate(ACM_ISAC_STRUCT* /* inst */) {
 #endif
 
 ACMISAC::ACMISAC(int16_t codec_id)
-    : AudioDecoder(ACMCodecDB::neteq_decoders_[codec_id]),
-      codec_inst_crit_sect_(CriticalSectionWrapper::CreateCriticalSection()),
+    : codec_inst_crit_sect_(CriticalSectionWrapper::CreateCriticalSection()),
       is_enc_initialized_(false),
       isac_coding_mode_(CHANNEL_INDEPENDENT),
       enforce_frame_size_(false),
diff --git a/webrtc/modules/audio_coding/neteq/audio_decoder.cc b/webrtc/modules/audio_coding/neteq/audio_decoder.cc
index 0fdaa44be..04a74eef7 100644
--- a/webrtc/modules/audio_coding/neteq/audio_decoder.cc
+++ b/webrtc/modules/audio_coding/neteq/audio_decoder.cc
@@ -51,8 +51,6 @@ bool AudioDecoder::PacketHasFec(const uint8_t* encoded,
   return false;
 }
 
-NetEqDecoder AudioDecoder::codec_type() const { return codec_type_; }
-
 bool AudioDecoder::CodecSupported(NetEqDecoder codec_type) {
   switch (codec_type) {
     case kDecoderPCMu:
@@ -197,26 +195,24 @@ AudioDecoder* AudioDecoder::CreateAudioDecoder(NetEqDecoder codec_type) {
       return new AudioDecoderIsacFix;
 #elif defined(WEBRTC_CODEC_ISAC)
     case kDecoderISAC:
-      return new AudioDecoderIsac;
-#endif
-#ifdef WEBRTC_CODEC_ISAC
+      return new AudioDecoderIsac(16000);
     case kDecoderISACswb:
-      return new AudioDecoderIsacSwb;
     case kDecoderISACfb:
-      return new AudioDecoderIsacFb;
+      return new AudioDecoderIsac(32000);
 #endif
 #ifdef WEBRTC_CODEC_PCM16
     case kDecoderPCM16B:
     case kDecoderPCM16Bwb:
     case kDecoderPCM16Bswb32kHz:
     case kDecoderPCM16Bswb48kHz:
-      return new AudioDecoderPcm16B(codec_type);
+      return new AudioDecoderPcm16B;
     case kDecoderPCM16B_2ch:
     case kDecoderPCM16Bwb_2ch:
     case kDecoderPCM16Bswb32kHz_2ch:
     case kDecoderPCM16Bswb48kHz_2ch:
+      return new AudioDecoderPcm16BMultiCh(2);
     case kDecoderPCM16B_5ch:
-      return new AudioDecoderPcm16BMultiCh(codec_type);
+      return new AudioDecoderPcm16BMultiCh(5);
 #endif
 #ifdef WEBRTC_CODEC_G722
     case kDecoderG722:
@@ -226,19 +222,21 @@ AudioDecoder* AudioDecoder::CreateAudioDecoder(NetEqDecoder codec_type) {
 #endif
 #ifdef WEBRTC_CODEC_CELT
     case kDecoderCELT_32:
+      return new AudioDecoderCelt(1);
     case kDecoderCELT_32_2ch:
-      return new AudioDecoderCelt(codec_type);
+      return new AudioDecoderCelt(2);
 #endif
 #ifdef WEBRTC_CODEC_OPUS
     case kDecoderOpus:
+      return new AudioDecoderOpus(1);
     case kDecoderOpus_2ch:
-      return new AudioDecoderOpus(codec_type);
+      return new AudioDecoderOpus(2);
 #endif
     case kDecoderCNGnb:
     case kDecoderCNGwb:
     case kDecoderCNGswb32kHz:
     case kDecoderCNGswb48kHz:
-      return new AudioDecoderCng(codec_type);
+      return new AudioDecoderCng;
     case kDecoderRED:
     case kDecoderAVT:
     case kDecoderArbitrary:
diff --git a/webrtc/modules/audio_coding/neteq/audio_decoder_impl.cc b/webrtc/modules/audio_coding/neteq/audio_decoder_impl.cc
index 661f2b11c..0215f36d1 100644
--- a/webrtc/modules/audio_coding/neteq/audio_decoder_impl.cc
+++ b/webrtc/modules/audio_coding/neteq/audio_decoder_impl.cc
@@ -13,6 +13,7 @@
 #include <assert.h>
 #include <string.h>  // memmove
 
+#include "webrtc/base/checks.h"
 #ifdef WEBRTC_CODEC_CELT
 #include "webrtc/modules/audio_coding/codecs/celt/include/celt_interface.h"
 #endif
@@ -75,13 +76,7 @@ int AudioDecoderPcmA::PacketDuration(const uint8_t* encoded,
 
 // PCM16B
 #ifdef WEBRTC_CODEC_PCM16
-AudioDecoderPcm16B::AudioDecoderPcm16B(enum NetEqDecoder type)
-    : AudioDecoder(type) {
-  assert(type == kDecoderPCM16B ||
-         type == kDecoderPCM16Bwb ||
-         type == kDecoderPCM16Bswb32kHz ||
-         type == kDecoderPCM16Bswb48kHz);
-}
+AudioDecoderPcm16B::AudioDecoderPcm16B() {}
 
 int AudioDecoderPcm16B::Decode(const uint8_t* encoded, size_t encoded_len,
                                int16_t* decoded, SpeechType* speech_type) {
@@ -99,29 +94,15 @@ int AudioDecoderPcm16B::PacketDuration(const uint8_t* encoded,
   return static_cast<int>(encoded_len / (2 * channels_));
 }
 
-AudioDecoderPcm16BMultiCh::AudioDecoderPcm16BMultiCh(
-    enum NetEqDecoder type)
-    : AudioDecoderPcm16B(kDecoderPCM16B) {  // This will be changed below.
-  codec_type_ = type;  // Changing to actual type here.
-  switch (codec_type_) {
-    case kDecoderPCM16B_2ch:
-    case kDecoderPCM16Bwb_2ch:
-    case kDecoderPCM16Bswb32kHz_2ch:
-    case kDecoderPCM16Bswb48kHz_2ch:
-      channels_ = 2;
-      break;
-    case kDecoderPCM16B_5ch:
-      channels_ = 5;
-      break;
-    default:
-      assert(false);
-  }
+AudioDecoderPcm16BMultiCh::AudioDecoderPcm16BMultiCh(int num_channels) {
+  DCHECK(num_channels > 0);
+  channels_ = num_channels;
 }
 #endif
 
 // iLBC
 #ifdef WEBRTC_CODEC_ILBC
-AudioDecoderIlbc::AudioDecoderIlbc() : AudioDecoder(kDecoderILBC) {
+AudioDecoderIlbc::AudioDecoderIlbc() {
   WebRtcIlbcfix_DecoderCreate(reinterpret_cast<iLBC_decinst_t**>(&state_));
 }
 
@@ -152,9 +133,11 @@ int AudioDecoderIlbc::Init() {
 
 // iSAC float
 #ifdef WEBRTC_CODEC_ISAC
-AudioDecoderIsac::AudioDecoderIsac() : AudioDecoder(kDecoderISAC) {
+AudioDecoderIsac::AudioDecoderIsac(int decode_sample_rate_hz) {
+  DCHECK(decode_sample_rate_hz == 16000 || decode_sample_rate_hz == 32000);
   WebRtcIsac_Create(reinterpret_cast<ISACStruct**>(&state_));
-  WebRtcIsac_SetDecSampRate(static_cast<ISACStruct*>(state_), 16000);
+  WebRtcIsac_SetDecSampRate(static_cast<ISACStruct*>(state_),
+                            decode_sample_rate_hz);
 }
 
 AudioDecoderIsac::~AudioDecoderIsac() {
@@ -209,22 +192,11 @@ int AudioDecoderIsac::IncomingPacket(const uint8_t* payload,
 int AudioDecoderIsac::ErrorCode() {
   return WebRtcIsac_GetErrorCode(static_cast<ISACStruct*>(state_));
 }
-
-// iSAC SWB
-AudioDecoderIsacSwb::AudioDecoderIsacSwb() : AudioDecoderIsac() {
-  codec_type_ = kDecoderISACswb;
-  WebRtcIsac_SetDecSampRate(static_cast<ISACStruct*>(state_), 32000);
-}
-
-// iSAC FB
-AudioDecoderIsacFb::AudioDecoderIsacFb() : AudioDecoderIsacSwb() {
-  codec_type_ = kDecoderISACfb;
-}
 #endif
 
 // iSAC fix
 #ifdef WEBRTC_CODEC_ISACFX
-AudioDecoderIsacFix::AudioDecoderIsacFix() : AudioDecoder(kDecoderISAC) {
+AudioDecoderIsacFix::AudioDecoderIsacFix() {
   WebRtcIsacfix_Create(reinterpret_cast<ISACFIX_MainStruct**>(&state_));
 }
 
@@ -266,7 +238,7 @@ int AudioDecoderIsacFix::ErrorCode() {
 
 // G.722
 #ifdef WEBRTC_CODEC_G722
-AudioDecoderG722::AudioDecoderG722() : AudioDecoder(kDecoderG722) {
+AudioDecoderG722::AudioDecoderG722() {
   WebRtcG722_CreateDecoder(reinterpret_cast<G722DecInst**>(&state_));
 }
 
@@ -382,14 +354,9 @@ void AudioDecoderG722Stereo::SplitStereoPacket(const uint8_t* encoded,
 
 // CELT
 #ifdef WEBRTC_CODEC_CELT
-AudioDecoderCelt::AudioDecoderCelt(enum NetEqDecoder type)
-    : AudioDecoder(type) {
-  assert(type == kDecoderCELT_32 || type == kDecoderCELT_32_2ch);
-  if (type == kDecoderCELT_32) {
-    channels_ = 1;
-  } else {
-    channels_ = 2;
-  }
+AudioDecoderCelt::AudioDecoderCelt(int num_channels) {
+  DCHECK(num_channels == 1 || num_channels == 2);
+  channels_ = num_channels;
   WebRtcCelt_CreateDec(reinterpret_cast<CELT_decinst_t**>(&state_),
                        static_cast<int>(channels_));
 }
@@ -431,13 +398,9 @@ int AudioDecoderCelt::DecodePlc(int num_frames, int16_t* decoded) {
 
 // Opus
 #ifdef WEBRTC_CODEC_OPUS
-AudioDecoderOpus::AudioDecoderOpus(enum NetEqDecoder type)
-    : AudioDecoder(type) {
-  if (type == kDecoderOpus_2ch) {
-    channels_ = 2;
-  } else {
-    channels_ = 1;
-  }
+AudioDecoderOpus::AudioDecoderOpus(int num_channels) {
+  DCHECK(num_channels == 1 || num_channels == 2);
+  channels_ = num_channels;
   WebRtcOpus_DecoderCreate(reinterpret_cast<OpusDecInst**>(&state_),
                            static_cast<int>(channels_));
 }
@@ -494,10 +457,7 @@ bool AudioDecoderOpus::PacketHasFec(const uint8_t* encoded,
 }
 #endif
 
-AudioDecoderCng::AudioDecoderCng(enum NetEqDecoder type)
-    : AudioDecoder(type) {
-  assert(type == kDecoderCNGnb || type == kDecoderCNGwb ||
-         kDecoderCNGswb32kHz || type == kDecoderCNGswb48kHz);
+AudioDecoderCng::AudioDecoderCng() {
   WebRtcCng_CreateDec(reinterpret_cast<CNG_dec_inst**>(&state_));
   assert(state_);
 }
diff --git a/webrtc/modules/audio_coding/neteq/audio_decoder_impl.h b/webrtc/modules/audio_coding/neteq/audio_decoder_impl.h
index 265d660bd..214392e7e 100644
--- a/webrtc/modules/audio_coding/neteq/audio_decoder_impl.h
+++ b/webrtc/modules/audio_coding/neteq/audio_decoder_impl.h
@@ -26,7 +26,7 @@ namespace webrtc {
 
 class AudioDecoderPcmU : public AudioDecoder {
  public:
-  AudioDecoderPcmU() : AudioDecoder(kDecoderPCMu) {}
+  AudioDecoderPcmU() {}
   virtual int Decode(const uint8_t* encoded, size_t encoded_len,
                      int16_t* decoded, SpeechType* speech_type);
   virtual int Init() { return 0; }
@@ -38,7 +38,7 @@ class AudioDecoderPcmU : public AudioDecoder {
 
 class AudioDecoderPcmA : public AudioDecoder {
  public:
-  AudioDecoderPcmA() : AudioDecoder(kDecoderPCMa) {}
+  AudioDecoderPcmA() {}
   virtual int Decode(const uint8_t* encoded, size_t encoded_len,
                      int16_t* decoded, SpeechType* speech_type);
   virtual int Init() { return 0; }
@@ -75,7 +75,7 @@ class AudioDecoderPcmAMultiCh : public AudioDecoderPcmA {
 // The type is specified in the constructor parameter |type|.
 class AudioDecoderPcm16B : public AudioDecoder {
  public:
-  explicit AudioDecoderPcm16B(enum NetEqDecoder type);
+  AudioDecoderPcm16B();
   virtual int Decode(const uint8_t* encoded, size_t encoded_len,
                      int16_t* decoded, SpeechType* speech_type);
   virtual int Init() { return 0; }
@@ -90,7 +90,7 @@ class AudioDecoderPcm16B : public AudioDecoder {
 // of channels is derived from the type.
 class AudioDecoderPcm16BMultiCh : public AudioDecoderPcm16B {
  public:
-  explicit AudioDecoderPcm16BMultiCh(enum NetEqDecoder type);
+  explicit AudioDecoderPcm16BMultiCh(int num_channels);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioDecoderPcm16BMultiCh);
@@ -116,7 +116,7 @@ class AudioDecoderIlbc : public AudioDecoder {
 #ifdef WEBRTC_CODEC_ISAC
 class AudioDecoderIsac : public AudioDecoder {
  public:
-  AudioDecoderIsac();
+  explicit AudioDecoderIsac(int decode_sample_rate_hz);
   virtual ~AudioDecoderIsac();
   virtual int Decode(const uint8_t* encoded, size_t encoded_len,
                      int16_t* decoded, SpeechType* speech_type);
@@ -135,22 +135,6 @@ class AudioDecoderIsac : public AudioDecoder {
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioDecoderIsac);
 };
-
-class AudioDecoderIsacSwb : public AudioDecoderIsac {
- public:
-  AudioDecoderIsacSwb();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AudioDecoderIsacSwb);
-};
-
-class AudioDecoderIsacFb : public AudioDecoderIsacSwb {
- public:
-  AudioDecoderIsacFb();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AudioDecoderIsacFb);
-};
 #endif
 
 #ifdef WEBRTC_CODEC_ISACFX
@@ -215,7 +199,7 @@ class AudioDecoderG722Stereo : public AudioDecoderG722 {
 #ifdef WEBRTC_CODEC_CELT
 class AudioDecoderCelt : public AudioDecoder {
  public:
-  explicit AudioDecoderCelt(enum NetEqDecoder type);
+  explicit AudioDecoderCelt(int num_channels);
   virtual ~AudioDecoderCelt();
 
   virtual int Decode(const uint8_t* encoded, size_t encoded_len,
@@ -232,7 +216,7 @@ class AudioDecoderCelt : public AudioDecoder {
 #ifdef WEBRTC_CODEC_OPUS
 class AudioDecoderOpus : public AudioDecoder {
  public:
-  explicit AudioDecoderOpus(enum NetEqDecoder type);
+  explicit AudioDecoderOpus(int num_channels);
   virtual ~AudioDecoderOpus();
   virtual int Decode(const uint8_t* encoded, size_t encoded_len,
                      int16_t* decoded, SpeechType* speech_type);
@@ -257,7 +241,7 @@ class AudioDecoderOpus : public AudioDecoder {
 // specific CngDecoder class could both inherit from that class.
 class AudioDecoderCng : public AudioDecoder {
  public:
-  explicit AudioDecoderCng(enum NetEqDecoder type);
+  explicit AudioDecoderCng();
   virtual ~AudioDecoderCng();
   virtual int Decode(const uint8_t* encoded, size_t encoded_len,
                      int16_t* decoded, SpeechType* speech_type) { return -1; }
diff --git a/webrtc/modules/audio_coding/neteq/audio_decoder_unittest.cc b/webrtc/modules/audio_coding/neteq/audio_decoder_unittest.cc
index 5a3169611..c95214b26 100644
--- a/webrtc/modules/audio_coding/neteq/audio_decoder_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/audio_decoder_unittest.cc
@@ -298,7 +298,7 @@ class AudioDecoderPcm16BTest : public AudioDecoderTest {
     codec_input_rate_hz_ = 8000;
     frame_size_ = 160;
     data_length_ = 10 * frame_size_;
-    decoder_ = new AudioDecoderPcm16B(kDecoderPCM16B);
+    decoder_ = new AudioDecoderPcm16B;
     assert(decoder_);
   }
 
@@ -369,7 +369,7 @@ class AudioDecoderIsacFloatTest : public AudioDecoderTest {
     input_size_ = 160;
     frame_size_ = 480;
     data_length_ = 10 * frame_size_;
-    decoder_ = new AudioDecoderIsac;
+    decoder_ = new AudioDecoderIsac(16000);
     assert(decoder_);
     WebRtcIsac_Create(&encoder_);
     WebRtcIsac_SetEncSampRate(encoder_, 16000);
@@ -407,7 +407,7 @@ class AudioDecoderIsacSwbTest : public AudioDecoderTest {
     input_size_ = 320;
     frame_size_ = 960;
     data_length_ = 10 * frame_size_;
-    decoder_ = new AudioDecoderIsacSwb;
+    decoder_ = new AudioDecoderIsac(32000);
     assert(decoder_);
     WebRtcIsac_Create(&encoder_);
     WebRtcIsac_SetEncSampRate(encoder_, 32000);
@@ -438,19 +438,6 @@ class AudioDecoderIsacSwbTest : public AudioDecoderTest {
   int input_size_;
 };
 
-// This test is identical to AudioDecoderIsacSwbTest, except that it creates
-// an AudioDecoderIsacFb decoder object.
-class AudioDecoderIsacFbTest : public AudioDecoderIsacSwbTest {
- protected:
-  AudioDecoderIsacFbTest() : AudioDecoderIsacSwbTest() {
-    // Delete the |decoder_| that was created by AudioDecoderIsacSwbTest and
-    // create an AudioDecoderIsacFb object instead.
-    delete decoder_;
-    decoder_ = new AudioDecoderIsacFb;
-    assert(decoder_);
-  }
-};
-
 class AudioDecoderIsacFixTest : public AudioDecoderTest {
  protected:
   AudioDecoderIsacFixTest() : AudioDecoderTest() {
@@ -638,7 +625,7 @@ class AudioDecoderOpusTest : public AudioDecoderTest {
     codec_input_rate_hz_ = 48000;
     frame_size_ = 480;
     data_length_ = 10 * frame_size_;
-    decoder_ = new AudioDecoderOpus(kDecoderOpus);
+    decoder_ = new AudioDecoderOpus(1);
     AudioEncoderOpus::Config config;
     config.frame_size_ms = static_cast<int>(frame_size_) / 48;
     audio_encoder_.reset(new AudioEncoderOpus(config));
@@ -650,7 +637,7 @@ class AudioDecoderOpusStereoTest : public AudioDecoderOpusTest {
   AudioDecoderOpusStereoTest() : AudioDecoderOpusTest() {
     channels_ = 2;
     delete decoder_;
-    decoder_ = new AudioDecoderOpus(kDecoderOpus_2ch);
+    decoder_ = new AudioDecoderOpus(2);
     AudioEncoderOpus::Config config;
     config.frame_size_ms = static_cast<int>(frame_size_) / 48;
     config.num_channels = 2;
@@ -721,17 +708,6 @@ TEST_F(AudioDecoderIsacSwbTest, EncodeDecode) {
   DecodePlcTest();
 }
 
-TEST_F(AudioDecoderIsacFbTest, EncodeDecode) {
-  int tolerance = 19757;
-  double mse = 8.18e6;
-  int delay = 160;  // Delay from input to output.
-  EXPECT_TRUE(AudioDecoder::CodecSupported(kDecoderISACswb));
-  EncodeDecodeTest(0, tolerance, mse, delay);
-  ReInitTest();
-  EXPECT_TRUE(decoder_->HasDecodePlc());
-  DecodePlcTest();
-}
-
 TEST_F(AudioDecoderIsacFixTest, DISABLED_EncodeDecode) {
   int tolerance = 11034;
   double mse = 3.46e6;
diff --git a/webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc b/webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc
index 6f497199c..1e4e58af3 100644
--- a/webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc
@@ -189,21 +189,18 @@ TEST(DecoderDatabase, ActiveDecoders) {
   EXPECT_TRUE(changed);
   AudioDecoder* decoder = db.GetActiveDecoder();
   ASSERT_FALSE(decoder == NULL);  // Should get a decoder here.
-  EXPECT_EQ(kDecoderPCMu, decoder->codec_type());
 
   // Set the same again. Expect no change.
   EXPECT_EQ(DecoderDatabase::kOK, db.SetActiveDecoder(0, &changed));
   EXPECT_FALSE(changed);
   decoder = db.GetActiveDecoder();
   ASSERT_FALSE(decoder == NULL);  // Should get a decoder here.
-  EXPECT_EQ(kDecoderPCMu, decoder->codec_type());
 
   // Change active decoder.
   EXPECT_EQ(DecoderDatabase::kOK, db.SetActiveDecoder(103, &changed));
   EXPECT_TRUE(changed);
   decoder = db.GetActiveDecoder();
   ASSERT_FALSE(decoder == NULL);  // Should get a decoder here.
-  EXPECT_EQ(kDecoderISAC, decoder->codec_type());
 
   // Remove the active decoder, and verify that the active becomes NULL.
   EXPECT_EQ(DecoderDatabase::kOK, db.Remove(103));
@@ -213,7 +210,6 @@ TEST(DecoderDatabase, ActiveDecoders) {
   EXPECT_EQ(DecoderDatabase::kOK, db.SetActiveCngDecoder(13));
   decoder = db.GetActiveCngDecoder();
   ASSERT_FALSE(decoder == NULL);  // Should get a decoder here.
-  EXPECT_EQ(kDecoderCNGnb, decoder->codec_type());
 
   // Remove the active CNG decoder, and verify that the active becomes NULL.
   EXPECT_EQ(DecoderDatabase::kOK, db.Remove(13));
diff --git a/webrtc/modules/audio_coding/neteq/interface/audio_decoder.h b/webrtc/modules/audio_coding/neteq/interface/audio_decoder.h
index 9a2fb8b46..16d78c9e0 100644
--- a/webrtc/modules/audio_coding/neteq/interface/audio_decoder.h
+++ b/webrtc/modules/audio_coding/neteq/interface/audio_decoder.h
@@ -63,12 +63,7 @@ class AudioDecoder {
   // Used by PacketDuration below. Save the value -1 for errors.
   enum { kNotImplemented = -2 };
 
-  explicit AudioDecoder(enum NetEqDecoder type)
-    : codec_type_(type),
-      channels_(1),
-      state_(NULL) {
-  }
-
+  AudioDecoder() : channels_(1), state_(NULL) {}
   virtual ~AudioDecoder() {}
 
   // Decodes |encode_len| bytes from |encoded| and writes the result in
@@ -119,8 +114,6 @@ class AudioDecoder {
   // Returns true if the packet has FEC and false otherwise.
   virtual bool PacketHasFec(const uint8_t* encoded, size_t encoded_len) const;
 
-  virtual NetEqDecoder codec_type() const;
-
   // Returns the underlying decoder state.
   void* state() { return state_; }
 
@@ -140,7 +133,6 @@ class AudioDecoder {
  protected:
   static SpeechType ConvertSpeechType(int16_t type);
 
-  enum NetEqDecoder codec_type_;
   size_t channels_;
   void* state_;
 
diff --git a/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h b/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
index f3cecc245..95b564d13 100644
--- a/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
+++ b/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
@@ -19,7 +19,7 @@ namespace webrtc {
 
 class MockAudioDecoder : public AudioDecoder {
  public:
-  MockAudioDecoder() : AudioDecoder(kDecoderArbitrary) {}
+  MockAudioDecoder() {}
   virtual ~MockAudioDecoder() { Die(); }
   MOCK_METHOD0(Die, void());
   MOCK_METHOD4(Decode, int(const uint8_t*, size_t, int16_t*,
diff --git a/webrtc/modules/audio_coding/neteq/mock/mock_external_decoder_pcm16b.h b/webrtc/modules/audio_coding/neteq/mock/mock_external_decoder_pcm16b.h
index ef5e03e56..c15fa1acd 100644
--- a/webrtc/modules/audio_coding/neteq/mock/mock_external_decoder_pcm16b.h
+++ b/webrtc/modules/audio_coding/neteq/mock/mock_external_decoder_pcm16b.h
@@ -27,9 +27,7 @@ using ::testing::Invoke;
 // audio_decoder_impl.{cc, h}.
 class ExternalPcm16B : public AudioDecoder {
  public:
-  explicit ExternalPcm16B(enum NetEqDecoder type)
-      : AudioDecoder(type) {
-  }
+  ExternalPcm16B() {}
 
   virtual int Decode(const uint8_t* encoded, size_t encoded_len,
                      int16_t* decoded, SpeechType* speech_type) {
@@ -51,9 +49,7 @@ class ExternalPcm16B : public AudioDecoder {
 // The reason is that we can then track that the correct calls are being made.
 class MockExternalPcm16B : public ExternalPcm16B {
  public:
-  explicit MockExternalPcm16B(enum NetEqDecoder type)
-      : ExternalPcm16B(type),
-        real_(type) {
+  MockExternalPcm16B() {
     // By default, all calls are delegated to the real object.
     ON_CALL(*this, Decode(_, _, _, _))
         .WillByDefault(Invoke(&real_, &ExternalPcm16B::Decode));
@@ -67,8 +63,6 @@ class MockExternalPcm16B : public ExternalPcm16B {
         .WillByDefault(Invoke(&real_, &ExternalPcm16B::IncomingPacket));
     ON_CALL(*this, ErrorCode())
         .WillByDefault(Invoke(&real_, &ExternalPcm16B::ErrorCode));
-    ON_CALL(*this, codec_type())
-        .WillByDefault(Invoke(&real_, &ExternalPcm16B::codec_type));
   }
   virtual ~MockExternalPcm16B() { Die(); }
 
diff --git a/webrtc/modules/audio_coding/neteq/neteq_external_decoder_unittest.cc b/webrtc/modules/audio_coding/neteq/neteq_external_decoder_unittest.cc
index 6a8eafa10..2e07b4901 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_external_decoder_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_external_decoder_unittest.cc
@@ -47,7 +47,7 @@ class NetEqExternalDecoderTest : public ::testing::Test {
         frame_size_ms_(10),
         frame_size_samples_(frame_size_ms_ * samples_per_ms_),
         output_size_samples_(frame_size_ms_ * samples_per_ms_),
-        external_decoder_(new MockExternalPcm16B(kDecoderPCM16Bswb32kHz)),
+        external_decoder_(new MockExternalPcm16B),
         rtp_generator_(new test::RtpGenerator(samples_per_ms_)),
         payload_size_bytes_(0),
         last_send_time_(0),
@@ -241,7 +241,7 @@ class LargeTimestampJumpTest : public NetEqExternalDecoderTest {
     frame_size_samples_ = frame_size_ms_ * samples_per_ms_;
     output_size_samples_ = frame_size_ms_ * samples_per_ms_;
     EXPECT_CALL(*external_decoder_, Die()).Times(1);
-    external_decoder_.reset(new MockExternalPcm16B(kDecoderPCM16B));
+    external_decoder_.reset(new MockExternalPcm16B);
   }
 
   void SetUp() OVERRIDE {
diff --git a/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc b/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
index d5676d7b5..b3bd69ba3 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
@@ -422,8 +422,7 @@ TEST_F(NetEqImplTest, VerifyTimestampPropagation) {
   // sample, and then increasing by 1 for each sample.
   class CountingSamplesDecoder : public AudioDecoder {
    public:
-    explicit CountingSamplesDecoder(enum NetEqDecoder type)
-        : AudioDecoder(type), next_value_(1) {}
+    CountingSamplesDecoder() : next_value_(1) {}
 
     // Produce as many samples as input bytes (|encoded_len|).
     virtual int Decode(const uint8_t* encoded,
@@ -446,7 +445,7 @@ TEST_F(NetEqImplTest, VerifyTimestampPropagation) {
 
    private:
     int16_t next_value_;
-  } decoder_(kDecoderPCM16B);
+  } decoder_;
 
   EXPECT_EQ(NetEq::kOK,
             neteq_->RegisterExternalDecoder(