Remove unused flush operation from Chromium audio.

media/audio/audio_output_controller.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_AUDIO_OUTPUT_CONTROLLER_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_CONTROLLER_H_
 
 #include "base/atomic_ref_count.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
@@ skipping 104 matching lines @@
       const AudioParameters& params, SyncReader* sync_reader);
 
   // Methods to control playback of the stream.
 
   // Starts the playback of this audio output stream.
   void Play();
 
   // Pause this audio output stream.
   void Pause();
 
-  // Discard all audio data buffered in this output stream. This method only
-  // has effect when the stream is paused.
-  void Flush();
-
   // Closes the audio output stream. The state is changed and the resources
   // are freed on the audio manager thread. closed_task is executed after that.
   // Callbacks (EventHandler and SyncReader) must exist until closed_task is
   // called.
   //
   // It is safe to call this method more than once. Calls after the first one
   // will have no effect.
   void Close(const base::Closure& closed_task);
 
   // Sets the volume of the audio output stream.
@@ skipping 42 matching lines @@
   static const int kPollPauseInMilliseconds;
 
   AudioOutputController(AudioManager* audio_manager, EventHandler* handler,
                         const AudioParameters& params, SyncReader* sync_reader);
 
   // The following methods are executed on the audio manager thread.
   void DoCreate(bool is_for_device_change);
   void DoPlay();
   void PollAndStartIfDataReady();
   void DoPause();
-  void DoFlush();
   void DoClose();
   void DoSetVolume(double volume);
   void DoReportError();
   void DoStartDiverting(AudioOutputStream* to_stream);
   void DoStopDiverting();
 
   // Called at regular intervals during playback to check for a change in
   // silence and call EventHandler::OnAudible() when state changes occur.
   void MaybeInvokeAudibleCallback();
 
@@ skipping 53 matching lines @@
   // EventHandler::OnAudbile() to be called whenever a transition to a period of
   // silence or non-silence is detected.
   scoped_ptr<AudioSilenceDetector> silence_detector_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioOutputController);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_CONTROLLER_H_