ui/gfx: Use base::string16 now that string16 was moved into base namespace.

ui/gfx/font.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_GFX_FONT_H_
 #define UI_GFX_FONT_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 56 matching lines @@
   int GetHeight() const;
 
   // Returns the baseline, or ascent, of the font.
   int GetBaseline() const;
 
   // Returns the average character width for the font.
   int GetAverageCharacterWidth() const;
 
   // Returns the number of horizontal pixels needed to display the specified
   // string.
-  int GetStringWidth(const string16& text) const;
+  int GetStringWidth(const base::string16& text) const;
 
   // Returns the expected number of horizontal pixels needed to display the
   // specified length of characters. Call GetStringWidth() to retrieve the
   // actual number.
   int GetExpectedTextWidth(int length) const;
 
   // Returns the style of the font.
   int GetStyle() const;
 
   // Returns the font name in UTF-8.
@@ skipping 17 matching lines @@
   PlatformFont* platform_font() const { return platform_font_.get(); }
 
  private:
   // Wrapped platform font implementation.
   scoped_refptr<PlatformFont> platform_font_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_FONT_H_