Prefix string16 with base:: in ui/.

ui/views/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_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
@@ skipping 814 matching lines @@
   virtual FocusTraversable* GetPaneFocusTraversable();
 
   // Tooltips ------------------------------------------------------------------
 
   // Gets the tooltip for this View. If the View does not have a tooltip,
   // return false. If the View does have a tooltip, copy the tooltip into
   // the supplied string and return true.
   // Any time the tooltip text that a View is displaying changes, it must
   // invoke TooltipTextChanged.
   // |p| provides the coordinates of the mouse (relative to this view).
-  virtual bool GetTooltipText(const gfx::Point& p, string16* tooltip) const;
+  virtual bool GetTooltipText(const gfx::Point& p,
+                              base::string16* tooltip) const;
 
   // Returns the location (relative to this View) for the text on the tooltip
   // to display. If false is returned (the default), the tooltip is placed at
   // a default position.
   virtual bool GetTooltipTextOrigin(const gfx::Point& p, gfx::Point* loc) const;
 
   // Context menus -------------------------------------------------------------
 
   // Sets the ContextMenuController. Setting this to non-null makes the View
   // process mouse events.
@@ skipping 711 matching lines @@
   // Belongs to this view, but it's reference-counted on some platforms
   // so we can't use a scoped_ptr. It's dereferenced in the destructor.
   NativeViewAccessibility* native_view_accessibility_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_