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

content/renderer/media/media_stream_dispatcher_unittest.cc

 // Copyright (c) 2012 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 <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "content/common/media/media_stream_messages.h"
 #include "content/public/common/media_stream_request.h"
 #include "content/renderer/media/media_stream_dispatcher.h"
 #include "content/renderer/media/media_stream_dispatcher_eventhandler.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
 namespace content {
 namespace {
 
@@ skipping 381 matching lines @@
   std::string stream_label1 = "stream1";
   dispatcher->OnMessageReceived(MediaStreamMsg_StreamGenerated(
       kRouteId, ipc_request_id1, stream_label1,
       audio_device_array, video_device_array));
   EXPECT_EQ(handler->request_id_, kRequestId1);
   EXPECT_EQ(handler->label_, stream_label1);
   EXPECT_EQ(0u, dispatcher->requests_.size());
 }
 
 }  // namespace content