SetVolume and GetVolume take one volume instead of separate left and right vo...

chrome/renderer/audio_message_filter.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // MessageFilter that handles audio messages and delegates them to audio
 // renderers. Created on render thread, AudioMessageFilter is operated on
 // IO thread (main thread of render process), it intercepts audio messages
 // and process them on IO thread since these messages are time critical.
 
 #ifndef CHROME_RENDERER_AUDIO_MESSAGE_FILTER_H_
@@ skipping 13 matching lines @@
                                  const base::Time& message_timestamp) = 0;
 
     // Called when state of an audio stream has changed in the browser process.
     virtual void OnStateChanged(ViewMsg_AudioStreamState state) = 0;
 
     // Called when an audio stream has been created in the browser process.
     virtual void OnCreated(base::SharedMemoryHandle handle, size_t length) = 0;
 
     // Called when notification of stream volume is received from the browser
     // process.
-    virtual void OnVolume(double left, double right) = 0;
+    virtual void OnVolume(double volume) = 0;
   };
 
-  AudioMessageFilter(int32 route_id);
+  explicit AudioMessageFilter(int32 route_id);
   ~AudioMessageFilter();
 
   // Add a delegate to the map and return id of the entry.
   int32 AddDelegate(Delegate* delegate);
 
   // Remove a delegate referenced by |id| from the map.
   void RemoveDelegate(int32 id);
 
   // Sends an IPC message using |channel_|.
   bool Send(IPC::Message* message);
@@ skipping 16 matching lines @@
 
   // Received when browser process has created an audio output stream.
   void OnStreamCreated(int stream_id, base::SharedMemoryHandle handle,
                        int length);
 
   // Received when internal state of browser process' audio output device has
   // changed.
   void OnStreamStateChanged(int stream_id, ViewMsg_AudioStreamState state);
 
   // Notification of volume property of an audio output stream.
-  void OnStreamVolume(int stream_id, double left, double right);
+  void OnStreamVolume(int stream_id, double volume);
 
   // A map of stream ids to delegates.
   IDMap<Delegate> delegates_;
 
   IPC::Channel* channel_;
 
   int32 route_id_;
 
   MessageLoop* message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioMessageFilter);
 };
 
-#endif  // CHROME_RENDERER_AUDIO_MESSAGE_FITLER_H_
+#endif  // CHROME_RENDERER_AUDIO_MESSAGE_FILTER_H_
+