content/child: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/renderer/media/media_stream_video_source.h

 // Copyright 2014 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_MEDIA_STREAM_VIDEO_SOURCE_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 45 matching lines @@
   void AddTrack(MediaStreamVideoTrack* track,
                 const VideoCaptureDeliverFrameCB& frame_callback,
                 const blink::WebMediaConstraints& constraints,
                 const ConstraintsCallback& callback);
   void RemoveTrack(MediaStreamVideoTrack* track);
 
   // Return true if |name| is a constraint supported by MediaStreamVideoSource.
   static bool IsConstraintSupported(const std::string& name);
 
   // Returns the MessageLoopProxy where video frames will be delivered on.
-  const scoped_refptr<base::MessageLoopProxy>& io_message_loop() const;
+  base::SingleThreadTaskRunner* io_task_runner() const;
 
   // Constraint keys used by a video source.
   // Specified by draft-alvestrand-constraints-resolution-00b
   static const char kMinAspectRatio[];  // minAspectRatio
   static const char kMaxAspectRatio[];  // maxAspectRatio
   static const char kMaxWidth[];  // maxWidth
   static const char kMinWidth[];  // minWidth
   static const char kMaxHeight[];  // maxHeight
   static const char kMinHeight[];  // minHeight
   static const char kMaxFrameRate[];  // maxFrameRate
@@ skipping 105 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<MediaStreamVideoSource> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_