Remove VoEVideoSync interface.

webrtc/voice_engine/channel_proxy.h

 /*
  *  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 87 matching lines @@
                                            int max_frame_length_ms);
   virtual AudioMixer::Source::AudioFrameInfo GetAudioFrameWithInfo(
       int sample_rate_hz,
       AudioFrame* audio_frame);
   virtual int NeededFrequency() const;
   virtual void SetTransportOverhead(int transport_overhead_per_packet);
   virtual void AssociateSendChannel(const ChannelProxy& send_channel_proxy);
   virtual void DisassociateSendChannel();
   virtual void GetRtpRtcp(RtpRtcp** rtp_rtcp,
                           RtpReceiver** rtp_receiver) const;
-  virtual void GetDelayEstimate(int* jitter_buffer_delay_ms,
-                                int* playout_buffer_delay_ms) const;
   virtual uint32_t GetPlayoutTimestamp() const;
   virtual void SetMinimumPlayoutDelay(int delay_ms);
   virtual void SetRtcpRttStats(RtcpRttStats* rtcp_rtt_stats);
   virtual bool GetRecCodec(CodecInst* codec_inst) const;
   virtual bool GetSendCodec(CodecInst* codec_inst) const;
   virtual bool SetVADStatus(bool enable);
   virtual bool SetCodecFECStatus(bool enable);
   virtual bool SetOpusDtx(bool enable);
   virtual bool SetOpusMaxPlaybackRate(int frequency_hz);
   virtual bool SetSendCodec(const CodecInst& codec_inst);
   virtual bool SetSendCNPayloadType(int type, PayloadFrequencies frequency);
 
  private:
   Channel* channel() const;
 
-  rtc::ThreadChecker thread_checker_;
-  rtc::RaceChecker race_checker_;
+  // Thread checkers document and lock usage of some methods on voe::Channel to
+  // specific threads we know about. The goal is to eventually split up
+  // voe::Channel into parts with single-threaded semantics, and thereby reduce
+  // the need for locks.
+  rtc::ThreadChecker worker_thread_checker_;
+  rtc::ThreadChecker module_process_thread_checker_;
+  // Methods accessed from audio and video threads are checked for sequential-
+  // only access. We don't necessarily own and control these threads, so thread
+  // checkers cannot be used. E.g. Chromium may transfer "ownership" from one
+  // audio thread to another, but access is still sequential.
+  rtc::RaceChecker audio_thread_race_checker_;
+  rtc::RaceChecker video_capture_thread_race_checker_;
   ChannelOwner channel_owner_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(ChannelProxy);
 };
 }  // namespace voe
 }  // namespace webrtc
 
 #endif  // WEBRTC_VOICE_ENGINE_CHANNEL_PROXY_H_