Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/audio_output.h

Index: media/audio/audio_output.h
diff --git a/media/audio/audio_output.h b/media/audio/audio_output.h
index 4793e71e50b481aa4c1307a0f6ee14ee5a25212c..a12742ed70b823959dd0daa98f0848f6c8c0afec 100644
--- a/media/audio/audio_output.h
+++ b/media/audio/audio_output.h
@@ -91,9 +91,7 @@ class AudioOutputStream {
 
   // Starts playing audio and generating AudioSourceCallback::OnMoreData().
   // Since implementor of AudioOutputStream may have internal buffers, right
-  // after calling this method initial buffers are fetched. User of this
-  // object should prepare |AudioOutputStream::GetNumBuffers()| before calling
-  // AudioOutputStream::Start().
+  // after calling this method initial buffers are fetched.
   //
   // The output stream does not take ownership of this callback.
   virtual void Start(AudioSourceCallback* callback) = 0;
@@ -114,11 +112,6 @@ class AudioOutputStream {
   // After calling this method, the object should not be used anymore.
   virtual void Close() = 0;
 
-  // Gets the number of internal buffers used in this output stream. This
-  // method is useful for providing information about how user of this object
-  // should prepare initial buffers before calling AudioOutputStream::Start().
-  virtual size_t GetNumBuffers() = 0;
-
  protected:
   virtual ~AudioOutputStream() {}
 };
@@ -164,11 +157,6 @@ class AudioManager {
   virtual void MuteAll() = 0;
   virtual void UnMuteAll() = 0;
 
-  // For testing purposes only. Returns the internal buffer of the last
-  // AUDIO_MOCK AudioOutputStream closed. Returns NULL if none closed yet.
-  // The buffer size is the same as passed to AudioOutputStream::Open().
-  virtual const void* GetLastMockBuffer() = 0;
-
   // Get AudioManager singleton.
   // TODO(cpu): Define threading requirements for interacting with AudioManager.
   static AudioManager* GetAudioManager();