Explicitly only add transport-cc RTCP feedback param to default FlexFEC codec.

webrtc/media/engine/internalencoderfactory.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 35 matching lines @@
   supported_codecs_.push_back(cricket::VideoCodec(kRedCodecName));
   supported_codecs_.push_back(cricket::VideoCodec(kUlpfecCodecName));
 
   if (IsFlexfecFieldTrialEnabled()) {
     cricket::VideoCodec flexfec_codec(kFlexfecCodecName);
     // This value is currently arbitrarily set to 10 seconds. (The unit
     // is microseconds.) This parameter MUST be present in the SDP, but
     // we never use the actual value anywhere in our code however.
     // TODO(brandtr): Consider honouring this value in the sender and receiver.
     flexfec_codec.SetParam(kFlexfecFmtpRepairWindow, "10000000");
+    flexfec_codec.AddFeedbackParam(
+        FeedbackParam(kRtcpFbParamTransportCc, kParamValueEmpty));
+    flexfec_codec.AddFeedbackParam(
+        FeedbackParam(kRtcpFbParamRemb, kParamValueEmpty));
     supported_codecs_.push_back(flexfec_codec);
   }
 }
 
 InternalEncoderFactory::~InternalEncoderFactory() {}
 
 // WebRtcVideoEncoderFactory implementation.
 webrtc::VideoEncoder* InternalEncoderFactory::CreateVideoEncoder(
     const cricket::VideoCodec& codec) {
   const webrtc::VideoCodecType codec_type =
@@ skipping 15 matching lines @@
 InternalEncoderFactory::supported_codecs() const {
   return supported_codecs_;
 }
 
 void InternalEncoderFactory::DestroyVideoEncoder(
     webrtc::VideoEncoder* encoder) {
   delete encoder;
 }
 
 }  // namespace cricket