Prefix string16 with base:: in ui/.

ui/views/widget/native_widget_private.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_WIDGET_NATIVE_WIDGET_PRIVATE_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_
 
 #include "base/strings/string16.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 134 matching lines @@
   // Centers the window and sizes it to the specified size.
   virtual void CenterWindow(const gfx::Size& size) = 0;
 
   // Retrieves the window's current restored bounds and "show" state, for
   // persisting.
   virtual void GetWindowPlacement(
       gfx::Rect* bounds,
       ui::WindowShowState* show_state) const = 0;
 
   // Sets the NativeWindow title. Returns true if the title changed.
-  virtual bool SetWindowTitle(const string16& title) = 0;
+  virtual bool SetWindowTitle(const base::string16& title) = 0;
 
   // Sets the Window icons. |window_icon| is a 16x16 icon suitable for use in
   // a title bar. |app_icon| is a larger size for use in the host environment
   // app switching UI.
   virtual void SetWindowIcons(const gfx::ImageSkia& window_icon,
                               const gfx::ImageSkia& app_icon) = 0;
 
   // Initializes the modal type of the window to |modal_type|. Called from
   // NativeWidgetDelegate::OnNativeWidgetCreated() before the widget is
   // initially parented.
@@ skipping 54 matching lines @@
 
   // Overridden from NativeWidget:
   virtual internal::NativeWidgetPrivate* AsNativeWidgetPrivate() OVERRIDE;
   virtual ui::EventHandler* GetEventHandler() = 0;
 };
 
 }  // namespace internal
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_