Move SkTypeface to sk_sp.

gm/dftext.cpp

Index: gm/dftext.cpp
diff --git a/gm/dftext.cpp b/gm/dftext.cpp
index e6aba0894ed1b59693e423a07eb89046b8367be3..c7d9a8b1bf03231cc28a3e48b810815c833f1209 100644
--- a/gm/dftext.cpp
+++ b/gm/dftext.cpp
@@ -19,7 +19,7 @@ public:
 
 protected:
     void onOnceBeforeDraw() override {
-        sk_tool_utils::emoji_typeface(&fEmojiTypeface);
+        fEmojiTypeface = sk_tool_utils::emoji_typeface();
         fEmojiText = sk_tool_utils::emoji_sample_text();
     }
 
@@ -210,7 +210,7 @@ protected:
     }
 
 private:
-    SkAutoTUnref<SkTypeface> fEmojiTypeface;
+    sk_sp<SkTypeface> fEmojiTypeface;
     const char* fEmojiText;
 
     typedef skiagm::GM INHERITED;