Remove unused flush operation from Chromium audio.

media/audio/null_audio_sink.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/null_audio_sink.h"
 
 #include "base/bind.h"
 #include "base/message_loop_proxy.h"
 #include "media/audio/fake_audio_consumer.h"
 #include "media/base/audio_hash.h"
@@ skipping 36 matching lines @@
   DCHECK(initialized_);
 
   if (playing_)
     return;
 
   fake_consumer_->Start(base::Bind(
       &NullAudioSink::CallRender, base::Unretained(this)));
   playing_ = true;
 }
 
-void NullAudioSink::Pause(bool /* flush */) {
+void NullAudioSink::Pause() {
   DCHECK(message_loop_->BelongsToCurrentThread());
 
   if (!playing_)
     return;
 
   fake_consumer_->Stop();
   playing_ = false;
 }
 
 bool NullAudioSink::SetVolume(double volume) {
@@ skipping 14 matching lines @@
 void NullAudioSink::StartAudioHashForTesting() {
   DCHECK(!initialized_);
   audio_hash_.reset(new AudioHash());
 }
 
 std::string NullAudioSink::GetAudioHashForTesting() {
   return audio_hash_ ? audio_hash_->ToString() : std::string();
 }
 
 }  // namespace media