ui: Use skia::RefPtr<T> for implicit safe reference counting.

ui/gfx/platform_font_pango.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_PLATFORM_FONT_PANGO_H_
 #define UI_GFX_PLATFORM_FONT_PANGO_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
+#include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "ui/gfx/platform_font.h"
 
 class SkTypeface;
 class SkPaint;
 
 namespace gfx {
 
 class UI_EXPORT PlatformFontPango : public PlatformFont {
  public:
@@ skipping 25 matching lines @@
   virtual int GetStringWidth(const string16& text) const OVERRIDE;
   virtual int GetExpectedTextWidth(int length) const OVERRIDE;
   virtual int GetStyle() const OVERRIDE;
   virtual std::string GetFontName() const OVERRIDE;
   virtual int GetFontSize() const OVERRIDE;
   virtual NativeFont GetNativeFont() const OVERRIDE;
 
  private:
   // Create a new instance of this object with the specified properties. Called
   // from DeriveFont.
-  PlatformFontPango(SkTypeface* typeface,
+  PlatformFontPango(const skia::RefPtr<SkTypeface>& typeface,
                     const std::string& name,
                     int size,
                     int style);
   virtual ~PlatformFontPango();
 
   // Initialize this object.
   void InitWithNameAndSize(const std::string& font_name, int font_size);
-  void InitWithTypefaceNameSizeAndStyle(SkTypeface* typeface,
-                                        const std::string& name,
-                                        int size,
-                                        int style);
+  void InitWithTypefaceNameSizeAndStyle(
+      const skia::RefPtr<SkTypeface>& typeface,
+      const std::string& name,
+      int size,
+      int style);
   void InitFromPlatformFont(const PlatformFontPango* other);
 
   // Potentially slow call to get pango metrics (average width, underline info).
   void InitPangoMetrics();
 
   // Setup a Skia context to use the current typeface.
   void PaintSetup(SkPaint* paint) const;
 
   // Make |this| a copy of |other|.
   void CopyFont(const Font& other);
 
   // The average width of a character, initialized and cached if needed.
   double GetAverageWidth() const;
 
-  // These two both point to the same SkTypeface. We use the SkAutoUnref to
-  // handle the reference counting, but without @typeface_ we would have to
-  // cast the SkRefCnt from @typeface_helper_ every time.
-  scoped_ptr<SkAutoUnref> typeface_helper_;
-  SkTypeface* typeface_;
+  skia::RefPtr<SkTypeface> typeface_;
 
   // Additional information about the face
   // Skia actually expects a family name and not a font name.
   std::string font_family_;
   int font_size_pixels_;
   int style_;
 
   // Cached metrics, generated at construction.
   int height_pixels_;
   int ascent_pixels_;
 
   // The pango metrics are much more expensive so we wait until we need them
   // to compute them.
   bool pango_metrics_inited_;
   double average_width_pixels_;
   double underline_position_pixels_;
   double underline_thickness_pixels_;
 
   // The default font, used for the default constructor.
   static Font* default_font_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformFontPango);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PLATFORM_FONT_PANGO_H_