Change the default rtcp mux policy from negotiate to require.

content/renderer/media/rtc_peer_connection_handler.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_RTC_PEER_CONNECTION_HANDLER_H_
 #define CONTENT_RENDERER_MEDIA_RTC_PEER_CONNECTION_HANDLER_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 116 matching lines @@
       const blink::WebRTCSessionDescription& description) override;
   void setRemoteDescription(
       const blink::WebRTCVoidRequest& request,
       const blink::WebRTCSessionDescription& description) override;
 
   blink::WebRTCSessionDescription localDescription() override;
   blink::WebRTCSessionDescription remoteDescription() override;
 
   bool setConfiguration(
       const blink::WebRTCConfiguration& configuration) override;
-  void logSelectedRtcpMuxPolicy(
-      blink::RtcpMuxPolicy selectedRtcpMuxPolicy) override;
   bool addICECandidate(const blink::WebRTCICECandidate& candidate) override;
   bool addICECandidate(const blink::WebRTCVoidRequest& request,
                        const blink::WebRTCICECandidate& candidate) override;
   virtual void OnaddICECandidateResult(const blink::WebRTCVoidRequest& request,
                                        bool result);
 
   bool addStream(const blink::WebMediaStream& stream,
                  const blink::WebMediaConstraints& options) override;
   void removeStream(const blink::WebMediaStream& stream) override;
   void getStats(const blink::WebRTCStatsRequest& request) override;
@@ skipping 144 matching lines @@
   bool ice_state_seen_[webrtc::PeerConnectionInterface::kIceConnectionMax] = {};
 
   base::WeakPtrFactory<RTCPeerConnectionHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RTCPeerConnectionHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RTC_PEER_CONNECTION_HANDLER_H_