Prefix string16 with base:: in ui/.

ui/views/controls/button/menu_button.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_BUTTON_MENU_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
@@ skipping 16 matching lines @@
 class VIEWS_EXPORT MenuButton : public TextButton {
  public:
   static const char kViewClassName[];
 
   // How much padding to put on the left and right of the menu marker.
   static const int kMenuMarkerPaddingLeft;
   static const int kMenuMarkerPaddingRight;
 
   // Create a Button.
   MenuButton(ButtonListener* listener,
-             const string16& text,
+             const base::string16& text,
              MenuButtonListener* menu_button_listener,
              bool show_menu_marker);
   virtual ~MenuButton();
 
   bool show_menu_marker() const { return show_menu_marker_; }
   void set_menu_marker(const gfx::ImageSkia* menu_marker) {
     menu_marker_ = menu_marker;
   }
   const gfx::ImageSkia* menu_marker() const { return menu_marker_; }
 
@@ skipping 55 matching lines @@
   // If non-null the destuctor sets this to true. This is set while the menu is
   // showing and used to detect if the menu was deleted while running.
   bool* destroyed_flag_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_