Fix some string16 -> base::string16 that have crept into ui/.

ui/views/controls/link.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_LINK_H_
 #define UI_VIEWS_CONTROLS_LINK_H_
 
 #include <string>
 
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 33 matching lines @@
   virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE;
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
   virtual bool SkipDefaultKeyEventProcessing(
       const ui::KeyEvent& event) OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
   virtual void OnEnabledChanged() OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual void OnFocus() OVERRIDE;
   virtual void OnBlur() OVERRIDE;
   virtual void SetFont(const gfx::Font& font) OVERRIDE;
-  virtual void SetText(const string16& text) OVERRIDE;
+  virtual void SetText(const base::string16& text) OVERRIDE;
   virtual void SetEnabledColor(SkColor color) OVERRIDE;
 
   void SetPressedColor(SkColor color);
   void SetUnderline(bool underline);
 
   static const char kViewClassName[];
 
  private:
   void Init();
 
@@ skipping 14 matching lines @@
 
   // The color when the link is pressed.
   SkColor requested_pressed_color_;
 
   DISALLOW_COPY_AND_ASSIGN(Link);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_LINK_H_