Simplify AudioRendererImpl by using AudioDevice.

media/filters/audio_renderer_base.cc

Index: media/filters/audio_renderer_base.cc
diff --git a/media/filters/audio_renderer_base.cc b/media/filters/audio_renderer_base.cc
index 2528a70f5a6608d71a4a4e6eca51d66b6ef269ca..7960b07e7db3a5c0e02cb1cb68157c4b2a463752 100644
--- a/media/filters/audio_renderer_base.cc
+++ b/media/filters/audio_renderer_base.cc
@@ -147,8 +147,11 @@ void AudioRendererBase::ResumeAfterUnderflow(bool buffer_more_audio) {
 void AudioRendererBase::ConsumeAudioSamples(scoped_refptr<Buffer> buffer_in) {
   base::AutoLock auto_lock(lock_);
   DCHECK(state_ == kPaused || state_ == kSeeking || state_ == kPlaying ||
-         state_ == kUnderflow || state_ == kRebuffering);
-  DCHECK_GT(pending_reads_, 0u);
+         state_ == kUnderflow || state_ == kRebuffering ||
+         state_ == kStopped);
+  if (!pending_reads_)
+    return;
+
   --pending_reads_;
 
   // TODO(scherkus): this happens due to a race, primarily because Stop() is a