Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/linux/audio_manager_linux.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_LINUX_AUDIO_MANAGER_LINUX_H_
 #define MEDIA_AUDIO_LINUX_AUDIO_MANAGER_LINUX_H_
 
 #include "base/thread.h"
 #include "media/audio/audio_output.h"
 
 class AudioManagerLinux : public AudioManager {
  public:
   AudioManagerLinux();
 
   // 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();
 
  private:
   // Friend function for invoking the private destructor at exit.
   friend void DestroyAudioManagerLinux(void*);
   virtual ~AudioManagerLinux();
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerLinux);
 };
 
 #endif  // MEDIA_AUDIO_LINUX_AUDIO_MANAGER_LINUX_H_