Remove usage of VoEAudioProcessing from WVoE/MC.

webrtc/media/engine/webrtcvoiceengine.h

Index: webrtc/media/engine/webrtcvoiceengine.h
diff --git a/webrtc/media/engine/webrtcvoiceengine.h b/webrtc/media/engine/webrtcvoiceengine.h
index ea48544924ae0ce5c096c05a404f7ff5798319d1..0eeef482abfc099c1a82d4a5a5665726ef9ea32f 100644
--- a/webrtc/media/engine/webrtcvoiceengine.h
+++ b/webrtc/media/engine/webrtcvoiceengine.h
@@ -30,6 +30,12 @@
 #include "webrtc/modules/audio_processing/include/audio_processing.h"
 #include "webrtc/pc/channel.h"
 
+namespace webrtc {
+namespace voe {
+class TransmitMixer;
+}  // namespace voe
+}  // namespace webrtc
+
 namespace cricket {
 
 class AudioDeviceModule;
@@ -75,10 +81,6 @@ class WebRtcVoiceEngine final : public webrtc::TraceCallback  {
   void RegisterChannel(WebRtcVoiceMediaChannel* channel);
   void UnregisterChannel(WebRtcVoiceMediaChannel* channel);
 
-  // Called by WebRtcVoiceMediaChannel to set a gain offset from
-  // the default AGC target level.
-  bool AdjustAgcLevel(int delta);
-
   VoEWrapper* voe() { return voe_wrapper_.get(); }
   int GetLastEngineError();
 
@@ -109,6 +111,7 @@ class WebRtcVoiceEngine final : public webrtc::TraceCallback  {
   int CreateVoEChannel();
   webrtc::AudioDeviceModule* adm();
   webrtc::AudioProcessing* apm();
+  webrtc::voe::TransmitMixer* transmit_mixer();
 
   AudioCodecs CollectRecvCodecs() const;
 
@@ -120,6 +123,8 @@ class WebRtcVoiceEngine final : public webrtc::TraceCallback  {
   rtc::scoped_refptr<webrtc::AudioDecoderFactory> decoder_factory_;
   // Reference to the APM, owned by VoE.
   webrtc::AudioProcessing* apm_ = nullptr;
+  // Reference to the TransmitMixer, owned by VoE.
+  webrtc::voe::TransmitMixer* transmit_mixer_ = nullptr;
   // The primary instance of WebRtc VoiceEngine.
   std::unique_ptr<VoEWrapper> voe_wrapper_;
   rtc::scoped_refptr<webrtc::AudioState> audio_state_;