tools: s/SkAutoTUnref/sk_sp/

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4391

Change-Id: Iae8b032b00d3579c77f3b86370dde71c4649da45
Reviewed-on: https://skia-review.googlesource.com/4391
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/tools/sk_tool_utils_font.cpp b/tools/sk_tool_utils_font.cpp
index a1d50dd..bdd88d0 100644
--- a/tools/sk_tool_utils_font.cpp
+++ b/tools/sk_tool_utils_font.cpp
@@ -47,7 +47,7 @@
                      name, style.weight(), style.width(), style.slant());
             // If we called SkTypeface::CreateFromName() here we'd recurse infinitely,
             // so we reimplement its core logic here inline without the recursive aspect.
-            SkAutoTUnref<SkFontMgr> fm(SkFontMgr::RefDefault());
+            sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
             return sk_sp<SkTypeface>(fm->legacyCreateTypeface(name, style));
         }
     } else {