Remove unused flush operation from Chromium audio.

media/filters/audio_renderer_impl.cc

Index: media/filters/audio_renderer_impl.cc
diff --git a/media/filters/audio_renderer_impl.cc b/media/filters/audio_renderer_impl.cc
index bae0ec809997ba727cd1fdbe7686fb00efff321c..fd0a4104842ef8c97b247ad1515ad9dea0c33ae4 100644
--- a/media/filters/audio_renderer_impl.cc
+++ b/media/filters/audio_renderer_impl.cc
@@ -103,7 +103,7 @@ void AudioRendererImpl::Pause(const base::Closure& callback) {
 void AudioRendererImpl::DoPause() {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK(sink_);
-  sink_->Pause(false);
+  sink_->Pause();
 }
 
 void AudioRendererImpl::Flush(const base::Closure& callback) {
@@ -176,8 +176,7 @@ void AudioRendererImpl::Preroll(base::TimeDelta time,
     AttemptRead_Locked();
   }
 
-  // Pause and flush the stream when we preroll to a new location.
-  sink_->Pause(true);
+  sink_->Pause();
 }
 
 void AudioRendererImpl::Initialize(const scoped_refptr<DemuxerStream>& stream,