Refactor some receive-side stats.

Removes polling of CName as well as receive codec statistics in favor of
internal callbacks keeping a statistics struct up to date.

R=mflodman@webrtc.org, stefan@webrtc.org
BUG=1667

Review URL: https://webrtc-codereview.appspot.com/28259005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7950 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc

@@ -988,13 +988,13 @@ bool ModuleRtpRtcpImpl::StorePackets() const {
   return rtp_sender_.StorePackets();
 }
 
-void ModuleRtpRtcpImpl::RegisterSendChannelRtcpStatisticsCallback(
+void ModuleRtpRtcpImpl::RegisterRtcpStatisticsCallback(
     RtcpStatisticsCallback* callback) {
   rtcp_receiver_.RegisterRtcpStatisticsCallback(callback);
 }
 
-RtcpStatisticsCallback* ModuleRtpRtcpImpl::
-        GetSendChannelRtcpStatisticsCallback() {
+RtcpStatisticsCallback*
+ModuleRtpRtcpImpl::GetRtcpStatisticsCallback() {
   return rtcp_receiver_.GetRtcpStatisticsCallback();
 }