Remove unused flush operation from Chromium audio.

media/audio/audio_output_device.h

Index: media/audio/audio_output_device.h
diff --git a/media/audio/audio_output_device.h b/media/audio/audio_output_device.h
index 28a7098057f9fb22db4e4ba38d554a39dc9dd8b3..26137caa2ea1069446097cd717c23be80822eb08 100644
--- a/media/audio/audio_output_device.h
+++ b/media/audio/audio_output_device.h
@@ -83,7 +83,7 @@ class MEDIA_EXPORT AudioOutputDevice
   virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void Play() OVERRIDE;
-  virtual void Pause(bool flush) OVERRIDE;
+  virtual void Pause() OVERRIDE;
   virtual bool SetVolume(double volume) OVERRIDE;
 
   // Methods called on IO thread ----------------------------------------------
@@ -125,7 +125,7 @@ class MEDIA_EXPORT AudioOutputDevice
   // sends IPC messages on that thread.
   void CreateStreamOnIOThread(const AudioParameters& params);
   void PlayOnIOThread();
-  void PauseOnIOThread(bool flush);
+  void PauseOnIOThread();
   void ShutDownOnIOThread();
   void SetVolumeOnIOThread(double volume);