Remove GetVolume from media::AudioRendererSink.

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/stringprintf.h"
 #include "base/sys_byteorder.h"
 #include "base/threading/platform_thread.h"
@@ skipping 54 matching lines @@
 void NullAudioSink::SetPlaybackRate(float rate) {
   base::AutoLock auto_lock(lock_);
   playback_rate_ = rate;
 }
 
 bool NullAudioSink::SetVolume(double volume) {
   // Audio is always muted.
   return volume == 0.0;
 }
 
-void NullAudioSink::GetVolume(double* volume) {
-  // Audio is always muted.
-  *volume = 0.0;
-}
-
 void NullAudioSink::SetPlaying(bool is_playing) {
   base::AutoLock auto_lock(lock_);
   playing_ = is_playing;
 }
 
 NullAudioSink::~NullAudioSink() {
   DCHECK(!thread_.IsRunning());
   for (size_t i = 0; i < audio_data_.size(); ++i)
     delete [] audio_data_[i];
 }
@@ skipping 61 matching lines @@
     base::MD5Final(&digest, &md5_channel_contexts_[i]);
     base::MD5Update(&md5_channel_contexts_[0], base::StringPiece(
         reinterpret_cast<char*>(&digest), sizeof(base::MD5Digest)));
   }
 
   base::MD5Final(&digest, &md5_channel_contexts_[0]);
   return base::MD5DigestToBase16(digest);
 }
 
 }  // namespace media