Remove OnLocalSsrcChanged and rename EncoderStateFeedback.

webrtc/modules/rtp_rtcp/source/rtcp_receiver.cc

Index: webrtc/modules/rtp_rtcp/source/rtcp_receiver.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_receiver.cc b/webrtc/modules/rtp_rtcp/source/rtcp_receiver.cc
index 51bffb6563a2b503aa162ae6e4fd891201ff7d84..3c39e7d5f7fd908e313bf543637b49790e7134cf 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_receiver.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_receiver.cc
@@ -172,18 +172,9 @@ uint32_t RTCPReceiver::RemoteSSRC() const {
 
 void RTCPReceiver::SetSsrcs(uint32_t main_ssrc,
                             const std::set<uint32_t>& registered_ssrcs) {
-  uint32_t old_ssrc = 0;
-  {
-    rtc::CritScope lock(&_criticalSectionRTCPReceiver);
-    old_ssrc = main_ssrc_;
-    main_ssrc_ = main_ssrc;
-    registered_ssrcs_ = registered_ssrcs;
-  }
-  {
-    if (_cbRtcpIntraFrameObserver && old_ssrc != main_ssrc) {
-      _cbRtcpIntraFrameObserver->OnLocalSsrcChanged(old_ssrc, main_ssrc);
-    }
-  }
+  rtc::CritScope lock(&_criticalSectionRTCPReceiver);
+  main_ssrc_ = main_ssrc;
+  registered_ssrcs_ = registered_ssrcs;
 }
 
 int32_t RTCPReceiver::RTT(uint32_t remoteSSRC,