Fix playback rate w/o audio. Remove unused SetPlaybackRate().

media/filters/audio_renderer_impl.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/filters/audio_renderer_impl.h"
 
 #include <math.h>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 288 matching lines @@
   if (pending_read_ || state_ == kPaused)
     return;
   pending_read_ = true;
   decoder_->Read(read_cb_);
 }
 
 void AudioRendererImpl::SetPlaybackRate(float playback_rate) {
   DCHECK_LE(0.0f, playback_rate);
 
   if (!stopped_) {
-    // Notify sink of new playback rate.
-    sink_->SetPlaybackRate(playback_rate);
-
     // We have two cases here:
     // Play: GetPlaybackRate() == 0.0 && playback_rate != 0.0
     // Pause: GetPlaybackRate() != 0.0 && playback_rate == 0.0
     if (GetPlaybackRate() == 0.0f && playback_rate != 0.0f) {
       DoPlay();
     } else if (GetPlaybackRate() != 0.0f && playback_rate == 0.0f) {
       // Pause is easy, we can always pause.
       DoPause();
     }
   }
@@ skipping 222 matching lines @@
     case kUnderflow:
     case kRebuffering:
     case kStopped:
       if (status != PIPELINE_OK)
         error_cb_.Run(status);
       return;
   }
 }
 
 }  // namespace media