Remove MessageLoop methods from Filter interface

media/filters/ffmpeg_video_decoder.h

Index: media/filters/ffmpeg_video_decoder.h
diff --git a/media/filters/ffmpeg_video_decoder.h b/media/filters/ffmpeg_video_decoder.h
index 76e60e80eeb453e917dec9477ec3868f6fdd47e4..08586d4a070c5157ab48f7d834f92f4952dc829b 100644
--- a/media/filters/ffmpeg_video_decoder.h
+++ b/media/filters/ffmpeg_video_decoder.h
@@ -25,7 +25,8 @@ class VideoDecodeEngine;
 class FFmpegVideoDecoder : public VideoDecoder,
                            public VideoDecodeEngine::EventHandler {
  public:
-  explicit FFmpegVideoDecoder(VideoDecodeContext* decode_context);
+  explicit FFmpegVideoDecoder(MessageLoop* message_loop,
+                              VideoDecodeContext* decode_context);
   virtual ~FFmpegVideoDecoder();
 
   // Filter implementation.
@@ -41,6 +42,8 @@ class FFmpegVideoDecoder : public VideoDecoder,
   virtual void ProduceVideoFrame(scoped_refptr<VideoFrame> video_frame);
   virtual bool ProvidesBuffer();
 
+  MessageLoop* message_loop();
+
  private:
   // VideoDecodeEngine::EventHandler interface.
   virtual void OnInitializeComplete(const VideoCodecInfo& info);
@@ -109,6 +112,7 @@ class FFmpegVideoDecoder : public VideoDecoder,
   // the provided engine.
   virtual void SetVideoDecodeEngineForTest(VideoDecodeEngine* engine);
 
+  MessageLoop* message_loop_;
   size_t width_;
   size_t height_;
   MediaFormat media_format_;