Remove VoEVolumeControl interface.

webrtc/voice_engine/transmit_mixer.cc

Index: webrtc/voice_engine/transmit_mixer.cc
diff --git a/webrtc/voice_engine/transmit_mixer.cc b/webrtc/voice_engine/transmit_mixer.cc
index eb5866c9339fe3489aa96c0b6c6c61f90e2d6153..663c02f44e2aac8b007294b1702f973c60456717 100644
--- a/webrtc/voice_engine/transmit_mixer.cc
+++ b/webrtc/voice_engine/transmit_mixer.cc
@@ -289,9 +289,6 @@ TransmitMixer::PrepareDemux(const void* audioSamples,
     TypingDetection(keyPressed);
 #endif
 
-    // --- Mute signal
-    AudioFrameOperations::Mute(&_audioFrame, _mute, _mute);
-
     // --- Mix with file (does not affect the mixing frequency)
     if (_filePlaying)
     {
@@ -894,21 +891,6 @@ TransmitMixer::SetMixWithMicStatus(bool mix)
     _mixFileWithMicrophone = mix;
 }
 
-int
-TransmitMixer::SetMute(bool enable)
-{
-    WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
-                 "TransmitMixer::SetMute(enable=%d)", enable);
-    _mute = enable;
-    return 0;
-}
-
-bool
-TransmitMixer::Mute() const
-{
-    return _mute;
-}
-
 int8_t TransmitMixer::AudioLevel() const
 {
     // Speech + file level [0,9]