Prefix string16 with base:: in ui/.

ui/views/controls/button/image_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_IMAGE_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_IMAGE_BUTTON_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/layout.h"
@@ skipping 127 matching lines @@
 
   // Change the toggled state.
   void SetToggled(bool toggled);
 
   // Like ImageButton::SetImage(), but to set the graphics used for the
   // "has been toggled" state.  Must be called for each button state
   // before the button is toggled.
   void SetToggledImage(ButtonState state, const gfx::ImageSkia* image);
 
   // Set the tooltip text displayed when the button is toggled.
-  void SetToggledTooltipText(const string16& tooltip);
+  void SetToggledTooltipText(const base::string16& tooltip);
 
   // Overridden from ImageButton:
   virtual const gfx::ImageSkia& GetImage(ButtonState state) const OVERRIDE;
   virtual void SetImage(ButtonState state,
                         const gfx::ImageSkia* image) OVERRIDE;
 
   // Overridden from View:
   virtual bool GetTooltipText(const gfx::Point& p,
-                              string16* tooltip) const OVERRIDE;
+                              base::string16* tooltip) const OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 
  private:
   // The parent class's images_ member is used for the current images,
   // and this array is used to hold the alternative images.
   // We swap between the two when toggling.
   gfx::ImageSkia alternate_images_[STATE_COUNT];
 
   // True if the button is currently toggled.
   bool toggled_;
 
   // The parent class's tooltip_text_ is displayed when not toggled, and
   // this one is shown when toggled.
-  string16 toggled_tooltip_text_;
+  base::string16 toggled_tooltip_text_;
 
   DISALLOW_COPY_AND_ASSIGN(ToggleImageButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_IMAGE_BUTTON_H_