Use a direct include of the message_loop header in chrome/test/, chrome/tools/, chrome/utility/.

chrome/test/base/view_event_test_base.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 "chrome/test/base/view_event_test_base.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/test/base/interactive_test_utils.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/base/ime/input_method_initializer.h"
 #include "ui/base/test/ui_controls.h"
 #include "ui/message_center/message_center.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/desktop_aura/desktop_screen.h"
 #include "ui/views/widget/widget.h"
@@ skipping 190 matching lines @@
   dnd_thread_.reset(NULL);
 }
 
 void ViewEventTestBase::RunTestMethod(const base::Closure& task) {
   StopBackgroundThread();
 
   task.Run();
   if (HasFatalFailure())
     Done();
 }