Move some generic functions to AudioManagerBase to be inherited by platform-specific AudioManager***

media/audio/mac/audio_manager_mac.h

Index: media/audio/mac/audio_manager_mac.h
diff --git a/media/audio/mac/audio_manager_mac.h b/media/audio/mac/audio_manager_mac.h
index 2060b6631bcf76b44481fba3e84a3a325d859ecd..1add20f7433acbabe8ffd50b4ad1a7310dcebde5 100644
--- a/media/audio/mac/audio_manager_mac.h
+++ b/media/audio/mac/audio_manager_mac.h
@@ -21,27 +21,23 @@ class AudioManagerMac : public AudioManagerBase {
   virtual bool HasAudioInputDevices() OVERRIDE;
   virtual void GetAudioInputDeviceNames(media::AudioDeviceNames* device_names)
       OVERRIDE;
-  virtual AudioOutputStream* MakeAudioOutputStream(
-      const AudioParameters& params) OVERRIDE;
-  virtual AudioInputStream* MakeAudioInputStream(
-      const AudioParameters& params, const std::string& device_id) OVERRIDE;
   virtual void MuteAll() OVERRIDE;
   virtual void UnMuteAll() OVERRIDE;
 
-  // Mac-only method to free the streams created by above facoty methods.
-  // They are called internally by the respective audio stream when it has
-  // been closed.
-  void ReleaseOutputStream(AudioOutputStream* stream);
-  void ReleaseInputStream(AudioInputStream* stream);
+  // Implementation of AudioManagerBase.
+  virtual AudioOutputStream* MakeLinearOutputStream(
+      const AudioParameters& params) OVERRIDE;
+  virtual AudioOutputStream* MakeLowLatencyOutputStream(
+      const AudioParameters& params) OVERRIDE;
+  virtual AudioInputStream* MakeLinearInputStream(
+      const AudioParameters& params, const std::string& device_id) OVERRIDE;
+  virtual AudioInputStream* MakeLowLatencyInputStream(
+      const AudioParameters& params, const std::string& device_id) OVERRIDE;
 
  protected:
   virtual ~AudioManagerMac();
 
  private:
-
-  // Number of currently open output streams.
-  size_t num_output_streams_;
-
   DISALLOW_COPY_AND_ASSIGN(AudioManagerMac);
 };