Make FontListImpl RefCountedThreadSafe

ui/gfx/font_list_impl.h

 // Copyright 2014 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_LIST_IMPL_H_
 #define UI_GFX_FONT_LIST_IMPL_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/font.h"
 
 namespace gfx {
 
 // FontListImpl is designed to provide the implementation of FontList and
 // intended to be used only from FontList.  You must not use this class
 // directly.
 //
 // FontListImpl represents a list of fonts either in the form of Font vector or
 // in the form of a string representing font names, styles, and size.
 //
 // FontListImpl could be initialized either way without conversion to the other
 // form. The conversion to the other form is done only when asked to get the
 // other form.
 //
 // For the format of font description string, see font_list.h for details.
-class FontListImpl : public base::RefCounted<FontListImpl> {
+class FontListImpl : public base::RefCountedThreadSafe<FontListImpl> {
  public:
   // Creates a font list from a string representing font names, styles, and
   // size.
   explicit FontListImpl(const std::string& font_description_string);
 
   // Creates a font list from font names, styles, size and weight.
   FontListImpl(const std::vector<std::string>& font_names,
                int font_style,
                int font_size,
                Font::Weight font_weight);
@@ skipping 39 matching lines @@
   // Returns the font weight.
   Font::Weight GetFontWeight() const;
 
   // Returns the Font vector.
   const std::vector<Font>& GetFonts() const;
 
   // Returns the first font in the list.
   const Font& GetPrimaryFont() const;
 
  private:
-  friend class base::RefCounted<FontListImpl>;
+  friend class base::RefCountedThreadSafe<FontListImpl>;
 
   ~FontListImpl();
 
   // Extracts common font height and baseline into |common_height_| and
   // |common_baseline_|.
   void CacheCommonFontHeightAndBaseline() const;
 
   // Extracts font style and size into |font_style_| and |font_size_|.
   void CacheFontStyleAndSize() const;
 
@@ skipping 18 matching lines @@
 
   // Cached font style and size.
   mutable int font_style_;
   mutable int font_size_;
   mutable Font::Weight font_weight_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_FONT_LIST_IMPL_H_