Change the default rtcp mux policy from negotiate to require.

third_party/WebKit/public/platform/WebRTCPeerConnectionHandler.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 class WebRTCICECandidate;
 class WebRTCOfferOptions;
 class WebRTCSessionDescription;
 class WebRTCSessionDescriptionRequest;
 class WebRTCStatsRequest;
 class WebRTCVoidRequest;
 class WebString;
 struct WebRTCConfiguration;
 struct WebRTCDataChannelInit;
 
-// Used to back histogram value of
-// "WebRTC.PeerConnection.SelectedRtcpMuxPolicy", so treat as append-only.
-enum RtcpMuxPolicy {
-  RtcpMuxPolicyRequire,
-  RtcpMuxPolicyNegotiate,
-  RtcpMuxPolicyDefault,
-  RtcpMuxPolicyMax
-};
-
 class WebRTCPeerConnectionHandler {
  public:
   virtual ~WebRTCPeerConnectionHandler() {}
 
   virtual bool initialize(const WebRTCConfiguration&,
                           const WebMediaConstraints&) = 0;
 
   virtual void createOffer(const WebRTCSessionDescriptionRequest&,
                            const WebMediaConstraints&) = 0;
   virtual void createOffer(const WebRTCSessionDescriptionRequest&,
                            const WebRTCOfferOptions&) = 0;
   virtual void createAnswer(const WebRTCSessionDescriptionRequest&,
                             const WebMediaConstraints&) = 0;
   virtual void createAnswer(const WebRTCSessionDescriptionRequest&,
                             const WebRTCAnswerOptions&) = 0;
   virtual void setLocalDescription(const WebRTCVoidRequest&,
                                    const WebRTCSessionDescription&) = 0;
   virtual void setRemoteDescription(const WebRTCVoidRequest&,
                                     const WebRTCSessionDescription&) = 0;
   virtual WebRTCSessionDescription localDescription() = 0;
   virtual WebRTCSessionDescription remoteDescription() = 0;
   virtual bool setConfiguration(const WebRTCConfiguration&) = 0;
-  virtual void logSelectedRtcpMuxPolicy(RtcpMuxPolicy) = 0;
 
   // DEPRECATED
   virtual bool addICECandidate(const WebRTCICECandidate&) { return false; }
 
   virtual bool addICECandidate(const WebRTCVoidRequest&,
                                const WebRTCICECandidate&) {
     return false;
   }
   virtual bool addStream(const WebMediaStream&, const WebMediaConstraints&) = 0;
   virtual void removeStream(const WebMediaStream&) = 0;
   virtual void getStats(const WebRTCStatsRequest&) = 0;
   // Gets stats using the new stats collection API, see
   // third_party/webrtc/api/stats/.  These will replace the old stats collection
   // API when the new API has matured enough.
   virtual void getStats(std::unique_ptr<WebRTCStatsReportCallback>) = 0;
   virtual WebRTCDataChannelHandler* createDataChannel(
       const WebString& label,
       const WebRTCDataChannelInit&) = 0;
   virtual WebRTCDTMFSenderHandler* createDTMFSender(
       const WebMediaStreamTrack&) = 0;
   virtual void stop() = 0;
 };
 
 }  // namespace blink
 
 #endif  // WebRTCPeerConnectionHandler_h