Removed GetOutputVolume() and SetOutputVolume().

webrtc/pc/channelmanager.h

Index: webrtc/pc/channelmanager.h
diff --git a/webrtc/pc/channelmanager.h b/webrtc/pc/channelmanager.h
index 3b0c0e967eac42a3368baa7a6f60479bcc1e033f..9728c4b997988f2a10952010fa24731f4659a60b 100644
--- a/webrtc/pc/channelmanager.h
+++ b/webrtc/pc/channelmanager.h
@@ -120,8 +120,6 @@ class ChannelManager {
     return (!voice_channels_.empty() || !video_channels_.empty());
   }
 
-  bool GetOutputVolume(int* level);
-  bool SetOutputVolume(int level);
   // RTX will be enabled/disabled in engines that support it. The supporting
   // engines will start offering an RTX codec. Must be called before Init().
   bool SetVideoRtxEnabled(bool enable);
@@ -191,7 +189,6 @@ class ChannelManager {
   VideoChannels video_channels_;
   DataChannels data_channels_;
 
-  int audio_output_volume_;
   bool enable_rtx_;
 
   bool capturing_;