Move SkTypeface to sk_sp.

src/fonts/SkGScalerContext.h

Index: src/fonts/SkGScalerContext.h
diff --git a/src/fonts/SkGScalerContext.h b/src/fonts/SkGScalerContext.h
index 69d02ddf114132197be16d1841459502d58c45b1..3eb25a81da1c3416d9438c39a119447801618147 100644
--- a/src/fonts/SkGScalerContext.h
+++ b/src/fonts/SkGScalerContext.h
@@ -13,10 +13,9 @@
 
 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:
@@ -43,8 +42,8 @@ protected:
                           size_t length, void* data) const override;
 
 private:
-    SkTypeface* fProxy;
-    SkPaint     fPaint;
+    sk_sp<SkTypeface>   fProxy;
+    SkPaint             fPaint;
 };
 
 #endif