Remove all remaining traces of MessageLoopProxy.

content/renderer/media/gpu/rtc_video_decoder.h

Index: content/renderer/media/gpu/rtc_video_decoder.h
diff --git a/content/renderer/media/gpu/rtc_video_decoder.h b/content/renderer/media/gpu/rtc_video_decoder.h
index 274f6dfb6f6e77fda06fbd2afc7191e79ff2a4f0..d77220f5e4b6aa6d05bb681c86e757f6090faa2d 100644
--- a/content/renderer/media/gpu/rtc_video_decoder.h
+++ b/content/renderer/media/gpu/rtc_video_decoder.h
@@ -43,11 +43,11 @@ struct SyncToken;
 namespace content {
 
 // This class uses hardware accelerated video decoder to decode video for
-// WebRTC. |vda_message_loop_| is the message loop proxy of the media thread,
-// which VDA::Client methods run on. webrtc::VideoDecoder methods run on WebRTC
-// DecodingThread or Chrome_libJingle_WorkerThread, which are trampolined to
-// |vda_message_loop_|. Decode() is non-blocking and queues the buffers. Decoded
-// frames are delivered to WebRTC on |vda_message_loop_|.
+// WebRTC. Lives on the media thread, where VDA::Client methods run on.
+// webrtc::VideoDecoder methods run on WebRTC DecodingThread or
+// Chrome_libJingle_WorkerThread, which are trampolined to the media thread.
+// Decode() is non-blocking and queues the buffers. Decoded frames are
+// delivered to WebRTC on the media task runner.
 class CONTENT_EXPORT RTCVideoDecoder
     : NON_EXPORTED_BASE(public webrtc::VideoDecoder),
       public media::VideoDecodeAccelerator::Client {
@@ -163,7 +163,7 @@ class CONTENT_EXPORT RTCVideoDecoder
   // Tells VDA that a picture buffer can be recycled.
   void ReusePictureBuffer(int64_t picture_buffer_id);
 
-  // Creates |vda_| on |vda_loop_proxy_|.
+  // Creates |vda_| on the media thread.
   void CreateVDA(media::VideoCodecProfile profile, base::WaitableEvent* waiter);
 
   void DestroyTextures();
@@ -294,7 +294,7 @@ class CONTENT_EXPORT RTCVideoDecoder
   gfx::Size min_resolution_;
   gfx::Size max_resolution_;
 
-  // Must be destroyed, or invalidated, on |vda_loop_proxy_|
+  // Must be destroyed, or invalidated, on the media thread.
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<RTCVideoDecoder> weak_factory_;