Prefix string16 with base:: in ui/.

ui/views/controls/button/image_button.cc

 // 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.
 
 #include "ui/views/controls/button/image_button.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/gfx/animation/throb_animation.h"
 #include "ui/gfx/canvas.h"
@@ skipping 202 matching lines @@
                                         const gfx::ImageSkia* image) {
   if (toggled_) {
     images_[state] = image ? *image : gfx::ImageSkia();
     if (state_ == state)
       SchedulePaint();
   } else {
     alternate_images_[state] = image ? *image : gfx::ImageSkia();
   }
 }
 
-void ToggleImageButton::SetToggledTooltipText(const string16& tooltip) {
+void ToggleImageButton::SetToggledTooltipText(const base::string16& tooltip) {
   toggled_tooltip_text_ = tooltip;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ToggleImageButton, ImageButton overrides:
 
 const gfx::ImageSkia& ToggleImageButton::GetImage(ButtonState state) const {
   if (toggled_)
     return alternate_images_[state];
   return images_[state];
 }
 
 void ToggleImageButton::SetImage(ButtonState state,
                                  const gfx::ImageSkia* image) {
   if (toggled_) {
     alternate_images_[state] = image ? *image : gfx::ImageSkia();
   } else {
     images_[state] = image ? *image : gfx::ImageSkia();
     if (state_ == state)
       SchedulePaint();
   }
   PreferredSizeChanged();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ToggleImageButton, View overrides:
 
 bool ToggleImageButton::GetTooltipText(const gfx::Point& p,
-                                       string16* tooltip) const {
+                                       base::string16* tooltip) const {
   if (!toggled_ || toggled_tooltip_text_.empty())
     return Button::GetTooltipText(p, tooltip);
 
   *tooltip = toggled_tooltip_text_;
   return true;
 }
 
 void ToggleImageButton::GetAccessibleState(ui::AccessibleViewState* state) {
   ImageButton::GetAccessibleState(state);
   GetTooltipText(gfx::Point(), &state->name);
 }
 
 }  // namespace views