Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/mac/audio_output_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_OUTPUT_MAC_H_
 #define MEDIA_AUDIO_MAC_OUTPUT_MAC_H_
 
 #include <AudioToolbox/AudioQueue.h>
 #include <AudioToolbox/AudioFormat.h>
 
@@ skipping 17 matching lines @@
   // triggered by calling AudioOutputStream::Close().
   virtual ~PCMQueueOutAudioOutputStream();
 
   // 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();
 
  private:
   // The audio is double buffered.
   static const size_t kNumBuffers = 2;
 
   // The OS calls back here when an audio buffer has been processed.
   static void RenderCallback(void* p_this, AudioQueueRef queue,
                              AudioQueueBufferRef buffer);
   // Called when an error occurs.
   void HandleError(OSStatus err);
 
   // Structure that holds the stream format details such as bitrate.
   AudioStreamBasicDescription format_;
   // Handle to the OS audio queue object.
   AudioQueueRef audio_queue_;
   // Array of pointers to the OS managed audio buffers.
   AudioQueueBufferRef buffer_[kNumBuffers];
   // Pointer to the object that will provide the audio samples.
   AudioSourceCallback* source_;
   // Our creator, the audio manager needs to be notified when we close.
   AudioManagerMac* manager_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMQueueOutAudioOutputStream);
 };
 
 #endif  // MEDIA_AUDIO_MAC_OUTPUT_MAC_H_