Renaming 47 files from .cpp to .cc

In addition to our naming guidelines, this will cause these files to get parsed by Sonar, and to make searching/grepping the source using file extensions easier in the future.

BUG=
TEST=Compiling on Linux.

Review URL: http://webrtc-codereview.appspot.com/348005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1405 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/audio_coding/codecs/g711/g711.gypi

@@ -50,7 +50,7 @@
             'G711',
           ],
           'sources': [
-            'test/testG711.cpp',
+            'test/testG711.cc',
           ],
         },
       ], # targets

src/modules/audio_coding/codecs/g722/g722.gypi

@@ -50,7 +50,7 @@
             'G722',
           ],
           'sources': [
-            'test/testG722.cpp',
+            'test/testG722.cc',
           ],
         },
       ], # targets

src/modules/audio_coding/main/source/audio_coding_module.gypi

@@ -105,22 +105,22 @@
             '<(webrtc_root)/system_wrappers/source/system_wrappers.gyp:system_wrappers',
           ],
           'sources': [
-             '../test/ACMTest.cpp',
-             '../test/APITest.cpp',
-             '../test/Channel.cpp',
-             '../test/EncodeDecodeTest.cpp',
-             '../test/iSACTest.cpp',
-             '../test/PCMFile.cpp',
-             '../test/RTPFile.cpp',
-             '../test/SpatialAudio.cpp',
-             '../test/TestAllCodecs.cpp',
-             '../test/Tester.cpp',
-             '../test/TestFEC.cpp',
-             '../test/TestStereo.cpp',
-             '../test/TestVADDTX.cpp',
-             '../test/TimedTrace.cpp',
-             '../test/TwoWayCommunication.cpp',
-             '../test/utility.cpp',
+             '../test/ACMTest.cc',
+             '../test/APITest.cc',
+             '../test/Channel.cc',
+             '../test/EncodeDecodeTest.cc',
+             '../test/iSACTest.cc',
+             '../test/PCMFile.cc',
+             '../test/RTPFile.cc',
+             '../test/SpatialAudio.cc',
+             '../test/TestAllCodecs.cc',
+             '../test/Tester.cc',
+             '../test/TestFEC.cc',
+             '../test/TestStereo.cc',
+             '../test/TestVADDTX.cc',
+             '../test/TimedTrace.cc',
+             '../test/TwoWayCommunication.cc',
+             '../test/utility.cc',
           ],
         },
         {