Use sk_sp text blob APIs

gm/textblobcolortrans.cpp

Index: gm/textblobcolortrans.cpp
diff --git a/gm/textblobcolortrans.cpp b/gm/textblobcolortrans.cpp
index 1e7a66667a076288c46bc66e0e89a6e5102ef325..286dc77ef5ba08c3023f06f259d10fe5612ff0fc 100644
--- a/gm/textblobcolortrans.cpp
+++ b/gm/textblobcolortrans.cpp
@@ -48,7 +48,7 @@ protected:
         sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset - 8);
 
         // build
-        fBlob.reset(builder.build());
+        fBlob = builder.make();
     }
 
     SkString onShortName() override {
@@ -87,7 +87,7 @@ protected:
     }
 
 private:
-    SkAutoTUnref<const SkTextBlob> fBlob;
+    sk_sp<SkTextBlob> fBlob;
 
     static constexpr int kWidth = 675;
     static constexpr int kHeight = 1600;