Use a direct include of strings headers in ui/, part 3.

ui/views/controls/menu/menu_item_view.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_MENU_MENU_ITEM_VIEW_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_ITEM_VIEW_H_
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "build/build_config.h"
 #include "ui/base/models/menu_separator_types.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/controls/menu/menu_config.h"
 #include "ui/views/view.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 
 #include "ui/native_theme/native_theme.h"
@@ skipping 495 matching lines @@
   // If set to false, the right margin will be removed for menu lines
   // containing other elements.
   bool use_right_margin_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuItemView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_ITEM_VIEW_H_