Use a direct include of the message_loop header in content/, part 4.

content/renderer/media/rtc_video_decoder.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_RTC_VIDEO_DECODER_H_
 #define CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_
 
 #include <deque>
 #include <set>
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
 #include "media/base/bitstream_buffer.h"
 #include "media/base/video_decoder.h"
 #include "media/filters/gpu_video_decoder.h"
 #include "media/video/picture.h"
 #include "media/video/video_decode_accelerator.h"
 #include "third_party/webrtc/modules/video_coding/codecs/interface/video_codec_interface.h"
@@ skipping 242 matching lines @@
   // A buffer that has an id less than this should be dropped because Reset or
   // Release has been called. Guarded by |lock_|.
   int32 reset_bitstream_buffer_id_;
 
   DISALLOW_COPY_AND_ASSIGN(RTCVideoDecoder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_