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..82e5a8c9211e3052840a47bc1e069f0a46314197 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);
+  FFmpegVideoDecoder(MessageLoop* message_loop,
+                     VideoDecodeContext* decode_context);
   virtual ~FFmpegVideoDecoder();
 
   // Filter implementation.
@@ -109,6 +110,7 @@ class FFmpegVideoDecoder : public VideoDecoder,
   // the provided engine.
   virtual void SetVideoDecodeEngineForTest(VideoDecodeEngine* engine);
 
+  MessageLoop* message_loop_;
   size_t width_;
   size_t height_;
   MediaFormat media_format_;