Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/mac/audio_manager_mac.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.
 
 #ifndef MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
 #define MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
 
 #include "base/basictypes.h"
 #include "media/audio/audio_output.h"
 
 class PCMQueueOutAudioOutputStream;
 
 // Mac OS X implementation of the AudioManager singleton. This class is internal
 // to the audio output and only internal users can call methods not exposed by
 // the AudioManager class.
 class AudioManagerMac : public AudioManager {
  public:
   AudioManagerMac() {};
 
   // Implementation of AudioManager.
   virtual bool HasAudioDevices();
   virtual AudioOutputStream* MakeAudioStream(Format format, int channels,
                                              int sample_rate,
                                              char bits_per_sample);
   virtual void MuteAll();
   virtual void UnMuteAll();
-  virtual const void* GetLastMockBuffer();
 
   // Mac-only method to free a stream created in MakeAudioStream.
   // It is called internally by the audio stream when it has been closed.
   void ReleaseStream(PCMQueueOutAudioOutputStream* stream);
 
  private:
   friend void DestroyAudioManagerMac(void*);
   virtual ~AudioManagerMac() {};
   DISALLOW_COPY_AND_ASSIGN(AudioManagerMac);
 };
 
 #endif  // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_