Update some uses of char16 to use the base:: namespace.

ui/views/controls/menu/menu_controller.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_CONTROLLER_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_
 
 #include "build/build_config.h"
 
 #include <list>
@@ skipping 398 matching lines @@
   // the selection is changed such that the menu opens immediately.
   void OpenSubmenuChangeSelectionIfCan();
 
   // If possible, closes the submenu.
   void CloseSubmenu();
 
   // Returns details about which menu items match the mnemonic |key|.
   // |match_function| is used to determine which menus match.
   SelectByCharDetails FindChildForMnemonic(
       MenuItemView* parent,
-      char16 key,
-      bool (*match_function)(MenuItemView* menu, char16 mnemonic));
+      base::char16 key,
+      bool (*match_function)(MenuItemView* menu, base::char16 mnemonic));
 
   // Selects or accepts the appropriate menu item based on |details|. Returns
   // true if |Accept| was invoked (which happens if there aren't multiple item
   // with the same mnemonic and the item to select does not have a submenu).
   bool AcceptOrSelect(MenuItemView* parent, const SelectByCharDetails& details);
 
   // Selects by mnemonic, and if that doesn't work tries the first character of
   // the title. Returns true if a match was selected and the menu should exit.
-  bool SelectByChar(char16 key);
+  bool SelectByChar(base::char16 key);
 
   // For Windows and Aura we repost an event for some events that dismiss
   // the context menu. The event is then reprocessed to cause its result
   // if the context menu had not been present.
   // On non-aura Windows, a new mouse event is generated and posted to
   // the window (if there is one) at the location of the event. On
   // aura, the event is reposted on the RootWindow.
   void RepostEvent(SubmenuView* source, const ui::LocatedEvent& event);
 
   // Sets the drop target to new_item.
@@ skipping 149 matching lines @@
 
   // Set to true if the menu item was selected by touch.
   bool item_selected_by_touch_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuController);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_