Move SkTypeface to sk_sp.

src/fonts/SkGScalerContext.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGScalerContext_DEFINED
 #define SkGScalerContext_DEFINED
 
 #include "SkScalerContext.h"
 #include "SkTypeface.h"
 
 class SkGTypeface : public SkTypeface {
 public:
-    SkGTypeface(SkTypeface* proxy, const SkPaint&);
-    virtual ~SkGTypeface();
+    SkGTypeface(sk_sp<SkTypeface> proxy, const SkPaint&);
 
-    SkTypeface* proxy() const { return fProxy; }
+    SkTypeface* proxy() const { return fProxy.get(); }
     const SkPaint& paint() const { return fPaint; }
 
 protected:
     SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
                                            const SkDescriptor*) const override;
     void onFilterRec(SkScalerContextRec*) const override;
     SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
         PerGlyphInfo,
         const uint32_t* glyphIDs,
         uint32_t glyphIDsCount) const override;
     SkStreamAsset* onOpenStream(int* ttcIndex) const override;
     void onGetFontDescriptor(SkFontDescriptor*, bool* isLocal) const override;
 
     int onCharsToGlyphs(const void* chars, Encoding encoding,
                         uint16_t glyphs[], int glyphCount) const override;
     int onCountGlyphs() const override;
     int onGetUPEM() const override;
 
     void onGetFamilyName(SkString* familyName) const override;
     SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
 
     int onGetTableTags(SkFontTableTag tags[]) const override;
     size_t onGetTableData(SkFontTableTag, size_t offset,
                           size_t length, void* data) const override;
 
 private:
-    SkTypeface* fProxy;
-    SkPaint     fPaint;
+    sk_sp<SkTypeface>   fProxy;
+    SkPaint             fPaint;
 };
 
 #endif