Remove calls to deprecated MessageLoop methods in content.

content/renderer/media/media_stream_video_track_unittest.cc

 // 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.
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 106 matching lines @@
   DeliverVideoFrameAndWaitForRenderer(&sink);
 
   sink.DisconnectFromTrack();
 
   scoped_refptr<media::VideoFrame> frame =
       media::VideoFrame::CreateBlackFrame(
           gfx::Size(MediaStreamVideoSource::kDefaultWidth,
                     MediaStreamVideoSource::kDefaultHeight));
   mock_source()->DeliverVideoFrame(frame);
   // Wait for the IO thread to complete delivering frames.
-  io_message_loop()->RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
   EXPECT_EQ(2, sink.number_of_frames());
 }
 
 class CheckThreadHelper {
  public:
   CheckThreadHelper(base::Closure callback, bool* correct)
       : callback_(callback),
         correct_(correct) {
   }
 
@@ skipping 111 matching lines @@
   base::Closure quit_closure = run_loop.QuitClosure();
   EXPECT_CALL(sink, OnVideoFrame()).WillOnce(RunClosure(quit_closure));
   sink.ConnectToTrack(track);
   run_loop.Run();
   EXPECT_EQ(1, sink.number_of_frames());
 
   sink.DisconnectFromTrack();
 }
 
 }  // namespace content