Move SkTypeface to sk_sp.

gm/textblob.cpp

Index: gm/textblob.cpp
diff --git a/gm/textblob.cpp b/gm/textblob.cpp
index 02f3c878a370614f6c494eb27c5f1520e7f958ef..525cfd292d009cb63dedf6af24afbb155886d389 100644
--- a/gm/textblob.cpp
+++ b/gm/textblob.cpp
@@ -72,7 +72,7 @@ public:
 
 protected:
     void onOnceBeforeDraw() override {
-        fTypeface.reset(sk_tool_utils::create_portable_typeface("serif", SkTypeface::kNormal));
+        fTypeface = sk_tool_utils::create_portable_typeface("serif", SkTypeface::kNormal);
         SkPaint p;
         p.setTypeface(fTypeface);
         size_t txtLen = strlen(fText);
@@ -180,9 +180,9 @@ private:
         return builder.build();
     }
 
-    SkTDArray<uint16_t>      fGlyphs;
-    SkAutoTUnref<SkTypeface> fTypeface;
-    const char*              fText;
+    SkTDArray<uint16_t> fGlyphs;
+    sk_sp<SkTypeface>   fTypeface;
+    const char*         fText;
     typedef skiagm::GM INHERITED;
 };