Removing ASSERT for tcp candidate for port 0 and 9, as Android clients

may not be called with set_allow_tcp_listen(false).

This CL will also sends tcp candidate in RFC 6544 format.

BUG=https://code.google.com/p/webrtc/issues/detail?id=3677
R=braveyao@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/14119004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6880 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/app/webrtc/webrtcsdp.cc

@@ -1720,14 +1720,7 @@ void BuildCandidate(const std::vector<Candidate>& candidates,
     }
 
     if (it->protocol() == cricket::TCP_PROTOCOL_NAME) {
-      // In case of WebRTC, candidate must be always "active" only. That means
-      // it should have port number either 0 or 9.
-      ASSERT(it->address().port() == 0 ||
-             it->address().port() == cricket::DISCARD_PORT);
-      ASSERT(it->tcptype() == cricket::TCPTYPE_ACTIVE_STR);
-      // TODO(mallinath) : Uncomment below line once WebRTCSdp capable of
-      // parsing RFC 6544.
-      // os << kTcpCandidateType << " " << it->tcptype() << " ";
+      os << kTcpCandidateType << " " << it->tcptype() << " ";
     }
 
     // Extensions

talk/app/webrtc/webrtcsdp_unittest.cc

@@ -1631,7 +1631,7 @@ TEST_F(WebRtcSdpTest, SerializeCandidates) {
 
 // TODO(mallinath) : Enable this test once WebRTCSdp capable of parsing
 // RFC 6544.
-TEST_F(WebRtcSdpTest, DISABLED_SerializeTcpCandidates) {
+TEST_F(WebRtcSdpTest, SerializeTcpCandidates) {
   Candidate candidate(
       "", ICE_CANDIDATE_COMPONENT_RTP, "tcp",
       rtc::SocketAddress("192.168.1.5", 9), kCandidatePriority,