Replace MessageLoopProxy with SingleThreadTaskRunner for media/filters/ + associated code.

media/filters/fake_video_decoder.h

Index: media/filters/fake_video_decoder.h
diff --git a/media/filters/fake_video_decoder.h b/media/filters/fake_video_decoder.h
index c1cf1a6a4cf6e5c87b6632c886e2c76a92315c7d..bd0b28450a917ddd6a47b285a058fce364f41616 100644
--- a/media/filters/fake_video_decoder.h
+++ b/media/filters/fake_video_decoder.h
@@ -22,7 +22,7 @@
 using base::ResetAndReturn;
 
 namespace base {
-class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }
 
 namespace media {
@@ -71,7 +71,7 @@ class FakeVideoDecoder : public VideoDecoder {
   void DoReset();
   void DoStop();
 
-  scoped_refptr<base::MessageLoopProxy> message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::WeakPtrFactory<FakeVideoDecoder> weak_factory_;
   base::WeakPtr<FakeVideoDecoder> weak_this_;