Cast: Restructure RTCP interface to better fit our usage.

media/cast/audio_receiver/audio_receiver.cc

Index: media/cast/audio_receiver/audio_receiver.cc
diff --git a/media/cast/audio_receiver/audio_receiver.cc b/media/cast/audio_receiver/audio_receiver.cc
index c3dc3937b9acf176364fcc8aa5dbe3a16461da3a..912da97f26b3339a396029da108b596e3e170913 100644
--- a/media/cast/audio_receiver/audio_receiver.cc
+++ b/media/cast/audio_receiver/audio_receiver.cc
@@ -80,7 +80,6 @@ AudioReceiver::AudioReceiver(scoped_refptr<CastEnvironment> cast_environment,
                              PacedPacketSender* const packet_sender)
     : cast_environment_(cast_environment),
       codec_(audio_config.codec),
-      incoming_ssrc_(audio_config.incoming_ssrc),
       frequency_(audio_config.frequency),
       audio_buffer_(),
       audio_decoder_(),
@@ -114,10 +113,9 @@ AudioReceiver::AudioReceiver(scoped_refptr<CastEnvironment> cast_environment,
                        rtp_audio_receiver_statistics_.get(),
                        audio_config.rtcp_mode,
                        rtcp_interval_delta,
-                       false,
                        audio_config.feedback_ssrc,
+                       audio_config.incoming_ssrc,
                        audio_config.rtcp_c_name));
-  rtcp_->SetRemoteSSRC(audio_config.incoming_ssrc);
   ScheduleNextRtcpReport();
   ScheduleNextCastMessage();
 }
@@ -280,7 +278,8 @@ void AudioReceiver::IncomingPacket(const uint8* packet, size_t length,
 }
 
 void AudioReceiver::CastFeedback(const RtcpCastMessage& cast_message) {
-  rtcp_->SendRtcpCast(cast_message);
+  // TODO(pwestin): add logging.
+  rtcp_->SendRtcpFromRtpReceiver(&cast_message, NULL);
 }
 
 base::TimeTicks AudioReceiver::GetPlayoutTime(base::TimeTicks now,
@@ -327,7 +326,8 @@ void AudioReceiver::ScheduleNextRtcpReport() {
 }
 
 void AudioReceiver::SendNextRtcpReport() {
-  rtcp_->SendRtcpReport(incoming_ssrc_);
+  // TODO(pwestin): add logging.
+  rtcp_->SendRtcpFromRtpReceiver(NULL, NULL);
   ScheduleNextRtcpReport();
 }