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

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>
 
@@ skipping 279 matching lines @@
   MenuDelegate* GetDelegate();
   const MenuDelegate* GetDelegate() const;
   void set_delegate(MenuDelegate* delegate) { delegate_ = delegate; }
 
   // Returns the root parent, or this if this has no parent.
   MenuItemView* GetRootMenuItem();
   const MenuItemView* GetRootMenuItem() const;
 
   // Returns the mnemonic for this MenuItemView, or 0 if this MenuItemView
   // doesn't have a mnemonic.
-  char16 GetMnemonic();
+  base::char16 GetMnemonic();
 
   // Do we have icons? This only has effect on the top menu. Turning this on
   // makes the menus slightly wider and taller.
   void set_has_icons(bool has_icons) {
     has_icons_ = has_icons;
   }
   bool has_icons() const { return has_icons_; }
 
   // Returns the descendant with the specified command.
   MenuItemView* GetMenuItemByID(int id);
@@ skipping 214 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_