Remove unused flush operation from Chromium audio.

media/audio/null_audio_sink.h

 // Copyright (c) 2012 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_NULL_AUDIO_SINK_H_
 #define MEDIA_AUDIO_NULL_AUDIO_SINK_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 11 matching lines @@
 class MEDIA_EXPORT NullAudioSink
     : NON_EXPORTED_BASE(public AudioRendererSink) {
  public:
   NullAudioSink(const scoped_refptr<base::MessageLoopProxy>& message_loop);
 
   // AudioRendererSink implementation.
   virtual void Initialize(const AudioParameters& params,
                           RenderCallback* callback) OVERRIDE;
   virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
-  virtual void Pause(bool flush) OVERRIDE;
+  virtual void Pause() OVERRIDE;
   virtual void Play() OVERRIDE;
   virtual bool SetVolume(double volume) OVERRIDE;
 
   // Enables audio frame hashing.  Must be called prior to Initialize().
   void StartAudioHashForTesting();
 
   // Returns the hash of all audio frames seen since construction.
   std::string GetAudioHashForTesting();
 
  protected:
@@ skipping 12 matching lines @@
 
   scoped_refptr<base::MessageLoopProxy> message_loop_;
   scoped_ptr<FakeAudioConsumer> fake_consumer_;
 
   DISALLOW_COPY_AND_ASSIGN(NullAudioSink);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_NULL_AUDIO_SINK_H_