Use base::MessageLoopProxy instead of MessageLoop* in webkit/media/.

webkit/media/webmediaplayer_impl.h

Index: webkit/media/webmediaplayer_impl.h
diff --git a/webkit/media/webmediaplayer_impl.h b/webkit/media/webmediaplayer_impl.h
index 9518f24c43ceb167c134d8a1eba7f213f7dbd6da..14a681769bb2a5c7f28f159a68486afa2bf6fe20 100644
--- a/webkit/media/webmediaplayer_impl.h
+++ b/webkit/media/webmediaplayer_impl.h
@@ -72,6 +72,10 @@ namespace WebKit {
 class WebFrame;
 }
 
+namespace base {
+class MessageLoopProxy;
+}
+
 namespace media {
 class ChunkDemuxer;
 class MediaLog;
@@ -282,9 +286,9 @@ class WebMediaPlayerImpl
   // Keep a list of buffered time ranges.
   WebKit::WebTimeRanges buffered_;
 
-  // Message loops for posting tasks between Chrome's main thread. Also used
+  // Message loops for posting tasks on Chrome's main thread. Also used
   // for DCHECKs so methods calls won't execute in the wrong thread.
-  MessageLoop* main_loop_;
+  scoped_refptr<base::MessageLoopProxy> main_loop_;
 
   scoped_ptr<media::FilterCollection> filter_collection_;
   scoped_refptr<media::Pipeline> pipeline_;