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

media/filters/decrypting_demuxer_stream.h

Index: media/filters/decrypting_demuxer_stream.h
diff --git a/media/filters/decrypting_demuxer_stream.h b/media/filters/decrypting_demuxer_stream.h
index cc34c04e27e5023176ce6727597177a281d3da0a..4e4cca2237497dedcd737ad14fed7aaf6e3d800a 100644
--- a/media/filters/decrypting_demuxer_stream.h
+++ b/media/filters/decrypting_demuxer_stream.h
@@ -15,7 +15,7 @@
 #include "media/base/video_decoder_config.h"
 
 namespace base {
-class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }
 
 namespace media {
@@ -24,12 +24,12 @@ class DecoderBuffer;
 
 // Decryptor-based DemuxerStream implementation that converts a potentially
 // encrypted demuxer stream to a clear demuxer stream.
-// All public APIs and callbacks are trampolined to the |message_loop_| so
+// All public APIs and callbacks are trampolined to the |task_runner_| so
 // that no locks are required for thread safety.
 class MEDIA_EXPORT DecryptingDemuxerStream : public DemuxerStream {
  public:
   DecryptingDemuxerStream(
-      const scoped_refptr<base::MessageLoopProxy>& message_loop,
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       const SetDecryptorReadyCB& set_decryptor_ready_cb);
   virtual ~DecryptingDemuxerStream();
 
@@ -89,7 +89,7 @@ class MEDIA_EXPORT DecryptingDemuxerStream : public DemuxerStream {
   // |demuxer_stream_|.
   void InitializeDecoderConfig();
 
-  scoped_refptr<base::MessageLoopProxy> message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::WeakPtrFactory<DecryptingDemuxerStream> weak_factory_;
   base::WeakPtr<DecryptingDemuxerStream> weak_this_;