Prefix string16 with base:: in ui/.

ui/views/win/hwnd_message_handler.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_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <windows.h>
 #include <atlbase.h>
 #include <atlapp.h>
@@ skipping 158 matching lines @@
 
   void SetCapture();
   void ReleaseCapture();
   bool HasCapture() const;
 
   FullscreenHandler* fullscreen_handler() { return fullscreen_handler_.get(); }
 
   void SetVisibilityChangedAnimationsEnabled(bool enabled);
 
   // Returns true if the title changed.
-  bool SetTitle(const string16& title);
+  bool SetTitle(const base::string16& title);
 
   void SetCursor(HCURSOR cursor);
 
   void FrameTypeChanged();
 
   void SchedulePaintInRect(const gfx::Rect& rect);
   void SetOpacity(BYTE opacity);
 
   void SetWindowIcons(const gfx::ImageSkia& window_icon,
                       const gfx::ImageSkia& app_icon);
@@ skipping 341 matching lines @@
 };
 
 // This window property if set on the window does not activate the window for a
 // touch based WM_MOUSEACTIVATE message.
 const wchar_t kIgnoreTouchMouseActivateForWindow[] =
     L"Chrome.IgnoreMouseActivate";
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_