Revert of Add RtcpRttStats to AudioStream

webrtc/voice_engine/channel_proxy.cc

 /*
  *  Copyright (c) 2015 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 196 matching lines @@
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
   int error = channel()->SetChannelOutputVolumeScaling(scaling);
   RTC_DCHECK_EQ(0, error);
 }
 
 void ChannelProxy::SetRtcEventLog(RtcEventLog* event_log) {
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
   channel()->SetRtcEventLog(event_log);
 }
 
-void ChannelProxy::SetRtcpRttStats(RtcpRttStats* rtcp_rtt_stats) {
-  RTC_DCHECK(thread_checker_.CalledOnValidThread());
-  channel()->SetRtcpRttStats(rtcp_rtt_stats);
-}
-
 Channel* ChannelProxy::channel() const {
   RTC_DCHECK(channel_owner_.channel());
   return channel_owner_.channel();
 }
 
 }  // namespace voe
 }  // namespace webrtc