Remove OnLocalSsrcChanged and rename EncoderStateFeedback.

webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h

 /*
  *  Copyright (c) 2012 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 203 matching lines @@
 class RtcpIntraFrameObserver {
  public:
   virtual void OnReceivedIntraFrameRequest(uint32_t ssrc) = 0;
 
   virtual void OnReceivedSLI(uint32_t ssrc,
                              uint8_t picture_id) = 0;
 
   virtual void OnReceivedRPSI(uint32_t ssrc,
                               uint64_t picture_id) = 0;
 
-  virtual void OnLocalSsrcChanged(uint32_t old_ssrc, uint32_t new_ssrc) = 0;
+  // TODO(mflodman): Remove completely.
+  virtual void OnLocalSsrcChanged(uint32_t old_ssrc, uint32_t new_ssrc) {}
 
   virtual ~RtcpIntraFrameObserver() {}
 };
 
 class RtcpBandwidthObserver {
  public:
   // REMB or TMMBR
   virtual void OnReceivedEstimatedBitrate(uint32_t bitrate) = 0;
 
   virtual void OnReceivedRtcpReceiverReport(
@@ skipping 154 matching lines @@
 class TransportSequenceNumberAllocator {
  public:
   TransportSequenceNumberAllocator() {}
   virtual ~TransportSequenceNumberAllocator() {}
 
   virtual uint16_t AllocateSequenceNumber() = 0;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_RTCP_DEFINES_H_