Use a direct include of the message_loop header in content/, part 2.

content/browser/renderer_host/media/media_stream_manager_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/bind.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/renderer_host/media/media_stream_ui_proxy.h"
 #include "content/common/media/media_stream_options.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "media/audio/audio_manager_base.h"
 #if defined(OS_ANDROID)
 #include "media/audio/android/audio_manager_android.h"
 #elif defined(OS_LINUX) || defined(OS_OPENBSD)
@@ skipping 146 matching lines @@
   std::string label2 = MakeMediaAccessRequest(1);
   media_stream_manager_->CancelRequest(label1);
 
   // Expecting the callback from the second request will be triggered and
   // quit the test.
   EXPECT_CALL(*this, Response(1));
   run_loop_.Run();
 }
 
 }  // namespace content