Remove MessageLoop methods from Filter interface

media/filters/ffmpeg_demuxer.cc

Index: media/filters/ffmpeg_demuxer.cc
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
index 7c4f763c19650319f2e4ca3fd82832b431f6ab91..8d5b840c78ff9a5992367a2e33bc13ae87d86a5d 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -239,12 +239,14 @@ base::TimeDelta FFmpegDemuxerStream::ConvertStreamTimestamp(
 //
 // FFmpegDemuxer
 //
-FFmpegDemuxer::FFmpegDemuxer()
-    : format_context_(NULL),
+FFmpegDemuxer::FFmpegDemuxer(MessageLoop* message_loop)
+    : message_loop_(message_loop),
+      format_context_(NULL),
       read_event_(false, false),
       read_has_failed_(false),
       last_read_bytes_(0),
       read_position_(0) {
+  DCHECK(message_loop_);
 }
 
 FFmpegDemuxer::~FFmpegDemuxer() {
@@ -391,6 +393,10 @@ bool FFmpegDemuxer::IsStreaming() {
   return data_source_->IsStreaming();
 }
 
+MessageLoop* FFmpegDemuxer::message_loop() {
+  return message_loop_;
+}
+
 void FFmpegDemuxer::InitializeTask(DataSource* data_source,
                                    FilterCallback* callback) {
   DCHECK_EQ(MessageLoop::current(), message_loop());