Change media MessageLoopProxy usage to SingleThreadTaskRunners.

content/renderer/media/texttrack_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_TEXTTRACK_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_TEXTTRACK_IMPL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/text_track.h"
 
 namespace base {
-class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }
 
 namespace blink {
 class WebInbandTextTrackClient;
 class WebMediaPlayerClient;
 }
 
 namespace content {
 
 class WebInbandTextTrackImpl;
 
 class TextTrackImpl : public media::TextTrack {
  public:
   // Constructor assumes ownership of the |text_track| object.
-  TextTrackImpl(const scoped_refptr<base::MessageLoopProxy>& message_loop,
+  TextTrackImpl(const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
                 blink::WebMediaPlayerClient* client,
                 scoped_ptr<WebInbandTextTrackImpl> text_track);
 
   virtual ~TextTrackImpl();
 
   virtual void addWebVTTCue(const base::TimeDelta& start,
                             const base::TimeDelta& end,
                             const std::string& id,
                             const std::string& content,
                             const std::string& settings) OVERRIDE;
 
  private:
   static void OnAddCue(WebInbandTextTrackImpl* text_track,
                        const base::TimeDelta& start,
                        const base::TimeDelta& end,
                        const std::string& id,
                        const std::string& content,
                        const std::string& settings);
 
   static void OnRemoveTrack(blink::WebMediaPlayerClient* client,
                             scoped_ptr<WebInbandTextTrackImpl> text_track);
 
-  scoped_refptr<base::MessageLoopProxy> message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   blink::WebMediaPlayerClient* client_;
   scoped_ptr<WebInbandTextTrackImpl> text_track_;
   DISALLOW_COPY_AND_ASSIGN(TextTrackImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_TEXTTRACK_IMPL_H_
-