Remove MessageLoop methods from Filter interface

media/filters/ffmpeg_video_decoder.cc

Index: media/filters/ffmpeg_video_decoder.cc
diff --git a/media/filters/ffmpeg_video_decoder.cc b/media/filters/ffmpeg_video_decoder.cc
index bdaee8cb72eead683c036c5a67d39b31ddd6bcdb..7df2495e2b015c180ea16f94ce78087b94ed7454 100644
--- a/media/filters/ffmpeg_video_decoder.cc
+++ b/media/filters/ffmpeg_video_decoder.cc
@@ -21,8 +21,10 @@
 
 namespace media {
 
-FFmpegVideoDecoder::FFmpegVideoDecoder(VideoDecodeContext* decode_context)
-    : width_(0),
+FFmpegVideoDecoder::FFmpegVideoDecoder(MessageLoop* message_loop,
+                                       VideoDecodeContext* decode_context)
+    : message_loop_(message_loop),
+      width_(0),
       height_(0),
       time_base_(new AVRational()),
       state_(kUnInitialized),
@@ -446,4 +448,8 @@ void FFmpegVideoDecoder::SetVideoDecodeEngineForTest(
   decode_engine_.reset(engine);
 }
 
+MessageLoop* FFmpegVideoDecoder::message_loop() {
+  return message_loop_;
+}
+
 }  // namespace media