Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/win/waveout_output_win.h

 // Copyright (c) 2006-2008 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_WIN_WAVEOUT_OUTPUT_WIN_H_
 #define MEDIA_AUDIO_WIN_WAVEOUT_OUTPUT_WIN_H_
 
 #include <windows.h>
 #include <mmsystem.h>
 
@@ skipping 22 matching lines @@
                               char bits_per_sample, UINT device_id);
   virtual ~PCMWaveOutAudioOutputStream();
 
   // Implementation of AudioOutputStream.
   virtual bool Open(size_t packet_size);
   virtual void Close();
   virtual void Start(AudioSourceCallback* callback);
   virtual void Stop();
   virtual void SetVolume(double left_level, double right_level);
   virtual void GetVolume(double* left_level, double* right_level);
-  virtual size_t GetNumBuffers();
 
   // Sends a buffer to the audio driver for playback.
   void QueueNextPacket(WAVEHDR* buffer);
 
  private:
   enum State {
     PCMA_BRAND_NEW,    // Initial state.
     PCMA_READY,        // Device obtained and ready to play.
     PCMA_PLAYING,      // Playing audio.
     PCMA_STOPPING,     // Trying to stop, waiting for callback to finish.
@@ skipping 47 matching lines @@
   WAVEHDR*  buffer_;
 
   // An event that is signaled when the callback thread is ready to stop.
   ScopedHandle stopped_event_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMWaveOutAudioOutputStream);
 };
 
 #endif  // MEDIA_AUDIO_WIN_WAVEOUT_OUTPUT_WIN_H_