Move passing of WebRTC rendering frames to IO thread

content/renderer/media/media_stream_video_renderer_sink.h

Index: content/renderer/media/media_stream_video_renderer_sink.h
diff --git a/content/renderer/media/media_stream_video_renderer_sink.h b/content/renderer/media/media_stream_video_renderer_sink.h
index 7321e49f6a54e42e5591d787977ddf4a67fd0256..46c9af36ef0cd85389ebb1f72f78d425feaf38fb 100644
--- a/content/renderer/media/media_stream_video_renderer_sink.h
+++ b/content/renderer/media/media_stream_video_renderer_sink.h
@@ -47,7 +47,6 @@ class CONTENT_EXPORT MediaStreamVideoRendererSink
       const blink::WebMediaStreamTrack& video_track,
       const base::Closure& error_cb,
       const MediaStreamVideoRenderer::RepaintCB& repaint_cb,
-      const scoped_refptr<base::SingleThreadTaskRunner>& compositor_task_runner,
       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
       const scoped_refptr<base::TaskRunner>& worker_task_runner,
       media::GpuVideoAcceleratorFactories* gpu_factories);
@@ -91,7 +90,6 @@ class CONTENT_EXPORT MediaStreamVideoRendererSink
   class FrameDeliverer;
   std::unique_ptr<FrameDeliverer> frame_deliverer_;
 
-  const scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
   const scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
   const scoped_refptr<base::TaskRunner> worker_task_runner_;
   media::GpuVideoAcceleratorFactories* const gpu_factories_;