Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/win/audio_manager_win.h

Index: media/audio/win/audio_manager_win.h
diff --git a/media/audio/win/audio_manager_win.h b/media/audio/win/audio_manager_win.h
index 12a4c06a436aaac031c9012a041345ac0ee2c4b5..f060fc4851cd6f596899cdbecf20664ae8287299 100644
--- a/media/audio/win/audio_manager_win.h
+++ b/media/audio/win/audio_manager_win.h
@@ -11,7 +11,6 @@
 #include "media/audio/audio_output.h"
 
 class PCMWaveOutAudioOutputStream;
-class AudioOutputStreamMockWin;
 
 // Windows implementation of the AudioManager singleton. This class is internal
 // to the audio output and only internal users can call methods not exposed by
@@ -26,12 +25,10 @@ class AudioManagerWin : public AudioManager {
                                              char bits_per_sample);
   virtual void MuteAll();
   virtual void UnMuteAll();
-  virtual const void* GetLastMockBuffer();
 
   // Windows-only methods to free a stream created in MakeAudioStream. These
   // are called internally by the audio stream when it has been closed.
   void ReleaseStream(PCMWaveOutAudioOutputStream* stream);
-  void ReleaseStream(AudioOutputStreamMockWin* stream);
 
  private:
   friend void DestroyAudioManagerWin(void *);