fix typeface leak

gm/coloremoji.cpp

Index: gm/coloremoji.cpp
diff --git a/gm/coloremoji.cpp b/gm/coloremoji.cpp
index 029377e8e47a1d5d8f39f7d1732acbebf53073e1..8ef335a1586f0edf26f9aa52166053e3af9331e0 100644
--- a/gm/coloremoji.cpp
+++ b/gm/coloremoji.cpp
@@ -50,11 +50,11 @@ public:
 
 protected:
     struct EmojiFont {
-        SkTypeface* typeface;
+        SkAutoTUnref<SkTypeface> typeface;
         const char* text;
     } emojiFont;
     virtual void onOnceBeforeDraw() override {
-        emojiFont.typeface = sk_tool_utils::emoji_typeface();
+        sk_tool_utils::emoji_typeface(&emojiFont.typeface);
         emojiFont.text = sk_tool_utils::emoji_sample_text();
     }
 
@@ -155,10 +155,6 @@ protected:
         }
     }
 
-private:
-    SkAutoTUnref<SkTypeface> fCBDT_CBLC_Typeface;
-    SkAutoTUnref<SkTypeface> fSBIX_Typeface;
-
     typedef GM INHERITED;
 };