gm: s/SkAutoTUnref/sk_sp/

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4434

Change-Id: Ib2bea321617a17012190b33f2c7c439a5b6b3025
Reviewed-on: https://skia-review.googlesource.com/4434
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
diff --git a/gm/verttext.cpp b/gm/verttext.cpp
index 700fb25..9c9ddb0 100644
--- a/gm/verttext.cpp
+++ b/gm/verttext.cpp
@@ -46,7 +46,7 @@
     {
     }
 
-    //SkAutoTUnref<SkTypeface> fFace;
+    //sk_sp<SkTypeface> fFace;
 
 protected: