Avoid including gtest file directly, and go through base instead

chrome/browser/chromeos/login/language_switch_menu.h

 // Copyright (c) 2011 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 CHROME_BROWSER_CHROMEOS_LOGIN_LANGUAGE_SWITCH_MENU_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LANGUAGE_SWITCH_MENU_H_
 #pragma once
 
 #include <string>
 
+#include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
-#include "testing/gtest/include/gtest/gtest_prod.h"
 #include "ui/views/controls/menu/menu_delegate.h"
 #include "ui/views/controls/menu/view_menu_delegate.h"
 #include "ui/views/view.h"
 
 class WizardControllerTest_SwitchLanguage_Test;
 
 namespace views {
 class MenuItemView;
 class MenuRunner;
 }  // namespace views
@@ skipping 44 matching lines @@
   // Language locale name storage.
   scoped_ptr<LanguageList> language_list_;
 
   FRIEND_TEST(::WizardControllerTest, SwitchLanguage);
   DISALLOW_COPY_AND_ASSIGN(LanguageSwitchMenu);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LANGUAGE_SWITCH_MENU_H_