Add missing IWYU message_loop.h includes.

chrome/browser/ui/views/menu_model_adapter_test.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 "ui/views/controls/menu/menu_model_adapter.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/macros.h"
+#include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/test/base/interactive_test_utils.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "chrome/test/base/view_event_test_base.h"
 #include "ui/base/models/menu_model.h"
 #include "ui/base/test/ui_controls.h"
 #include "ui/views/controls/button/menu_button.h"
 #include "ui/views/controls/button/menu_button_listener.h"
 #include "ui/views/controls/menu/menu_controller.h"
 #include "ui/views/controls/menu/menu_item_view.h"
-#include "ui/views/controls/menu/menu_model_adapter.h"
 #include "ui/views/controls/menu/menu_runner.h"
 #include "ui/views/controls/menu/submenu_view.h"
 #include "ui/views/widget/root_view.h"
 #include "ui/views/widget/widget.h"
 
 namespace {
 
 const int kTopMenuBaseId = 100;
 const int kSubMenuBaseId = 200;
 
@@ skipping 238 matching lines @@
 
   views::MenuButton* button_;
   TopMenuModel top_menu_model_;
   views::MenuModelAdapter menu_model_adapter_;
   views::MenuItemView* menu_;
   std::unique_ptr<views::MenuRunner> menu_runner_;
 };
 
 // If this flakes, disable and log details in http://crbug.com/523255.
 VIEW_TEST(MenuModelAdapterTest, RebuildMenu)