Remove unused flush operation from Chromium audio.

media/audio/audio_output_controller.cc

 // 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.
 
 #include "media/audio/audio_output_controller.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/message_loop.h"
 #include "base/threading/platform_thread.h"
@@ skipping 71 matching lines @@
 void AudioOutputController::Play() {
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &AudioOutputController::DoPlay, this));
 }
 
 void AudioOutputController::Pause() {
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &AudioOutputController::DoPause, this));
 }
 
-void AudioOutputController::Flush() {
-  message_loop_->PostTask(FROM_HERE, base::Bind(
-      &AudioOutputController::DoFlush, this));
-}
-
 void AudioOutputController::Close(const base::Closure& closed_task) {
   DCHECK(!closed_task.is_null());
   message_loop_->PostTaskAndReply(FROM_HERE, base::Bind(
       &AudioOutputController::DoClose, this), closed_task);
 }
 
 void AudioOutputController::SetVolume(double volume) {
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &AudioOutputController::DoSetVolume, this, volume));
 }
@@ skipping 125 matching lines @@
 
   if (state_ != kPaused)
     return;
 
   // Send a special pause mark to the low-latency audio thread.
   sync_reader_->UpdatePendingBytes(kPauseMark);
 
   handler_->OnPaused();
 }
 
-void AudioOutputController::DoFlush() {
-  DCHECK(message_loop_->BelongsToCurrentThread());
-
-  // TODO(hclam): Actually flush the audio device.
-}
-
 void AudioOutputController::DoClose() {
   DCHECK(message_loop_->BelongsToCurrentThread());
 
   if (state_ != kClosed) {
     DoStopCloseAndClearStream();
     sync_reader_->Close();
     state_ = kClosed;
   }
 }
 
@@ skipping 167 matching lines @@
   DCHECK(base::AtomicRefCountIsZero(&num_allowed_io_));
   base::AtomicRefCountInc(&num_allowed_io_);
 }
 
 void AudioOutputController::DisallowEntryToOnMoreIOData() {
   const bool is_zero = !base::AtomicRefCountDec(&num_allowed_io_);
   DCHECK(is_zero);
 }
 
 }  // namespace media