Move SkTypeface to sk_sp.

src/fonts/SkRandomScalerContext.cpp

Index: src/fonts/SkRandomScalerContext.cpp
diff --git a/src/fonts/SkRandomScalerContext.cpp b/src/fonts/SkRandomScalerContext.cpp
index 245052053e3d40f77413913d4bf7ff7d60e93908..6d3718cbef0ef73085e750a0d11c3b837470430e 100644
--- a/src/fonts/SkRandomScalerContext.cpp
+++ b/src/fonts/SkRandomScalerContext.cpp
@@ -190,16 +190,12 @@ void SkRandomScalerContext::generateFontMetrics(SkPaint::FontMetrics* metrics) {
 
 #include "SkTypefaceCache.h"
 
-SkRandomTypeface::SkRandomTypeface(SkTypeface* proxy, const SkPaint& paint, bool fakeIt)
+SkRandomTypeface::SkRandomTypeface(sk_sp<SkTypeface> proxy, const SkPaint& paint, bool fakeIt)
     : SkTypeface(proxy->fontStyle(), SkTypefaceCache::NewFontID(), false)
-    , fProxy(SkRef(proxy))
+    , fProxy(std::move(proxy))
     , fPaint(paint)
     , fFakeIt(fakeIt) {}
 
-SkRandomTypeface::~SkRandomTypeface() {
-    fProxy->unref();
-}
-
 SkScalerContext* SkRandomTypeface::onCreateScalerContext(const SkScalerContextEffects& effects,
                                                          const SkDescriptor* desc) const {
     return new SkRandomScalerContext(const_cast<SkRandomTypeface*>(this), effects, desc, fFakeIt);