Revert of Add RtcpRttStats to AudioStream

webrtc/voice_engine/channel.h

Index: webrtc/voice_engine/channel.h
diff --git a/webrtc/voice_engine/channel.h b/webrtc/voice_engine/channel.h
index f2d48d8aadd2ec42e05e6964b4be4813b202c4d0..4988e079d1203a2322347b0e32c297650d4c40ff 100644
--- a/webrtc/voice_engine/channel.h
+++ b/webrtc/voice_engine/channel.h
@@ -67,7 +67,6 @@
 
 class OutputMixer;
 class RtcEventLogProxy;
-class RtcpRttStatsProxy;
 class RtpPacketSenderProxy;
 class Statistics;
 class StatisticsProxy;
@@ -418,8 +417,6 @@
   // Set a RtcEventLog logging object.
   void SetRtcEventLog(RtcEventLog* event_log);
 
-  void SetRtcpRttStats(RtcpRttStats* rtcp_rtt_stats);
-
  protected:
   void OnIncomingFractionLoss(int fraction_lost);
 
@@ -455,7 +452,6 @@
   ChannelState channel_state_;
 
   std::unique_ptr<voe::RtcEventLogProxy> event_log_proxy_;
-  std::unique_ptr<voe::RtcpRttStatsProxy> rtcp_rtt_stats_proxy_;
 
   std::unique_ptr<RtpHeaderParser> rtp_header_parser_;
   std::unique_ptr<RTPPayloadRegistry> rtp_payload_registry_;