Move SkTypeface to sk_sp.

src/fonts/SkGScalerContext.cpp

Index: src/fonts/SkGScalerContext.cpp
diff --git a/src/fonts/SkGScalerContext.cpp b/src/fonts/SkGScalerContext.cpp
index 0a9601bd7e48cd1afb080557a340fcbf3c7136b7..1d34536cbe2933eff5094d3791f1665f4fea0275 100644
--- a/src/fonts/SkGScalerContext.cpp
+++ b/src/fonts/SkGScalerContext.cpp
@@ -151,14 +151,11 @@ void SkGScalerContext::generateFontMetrics(SkPaint::FontMetrics* metrics) {
 
 #include "SkTypefaceCache.h"
 
-SkGTypeface::SkGTypeface(SkTypeface* proxy, const SkPaint& paint)
+SkGTypeface::SkGTypeface(sk_sp<SkTypeface> proxy, const SkPaint& paint)
     : SkTypeface(proxy->fontStyle(), SkTypefaceCache::NewFontID(), false)
-    , fProxy(SkRef(proxy))
-    , fPaint(paint) {}
-
-SkGTypeface::~SkGTypeface() {
-    fProxy->unref();
-}
+    , fProxy(std::move(proxy))
+    , fPaint(paint)
+{}
 
 SkScalerContext* SkGTypeface::onCreateScalerContext(const SkScalerContextEffects& effects,
                                                     const SkDescriptor* desc) const {