Use sk_sp text blob APIs

gm/textblobblockreordering.cpp

Index: gm/textblobblockreordering.cpp
diff --git a/gm/textblobblockreordering.cpp b/gm/textblobblockreordering.cpp
index ea90308b1f46472af0e108e587a6da3bfc16a9fe..3974aca5ab0d9795e4a2585bb4ce7f6dc16b22c9 100644
--- a/gm/textblobblockreordering.cpp
+++ b/gm/textblobblockreordering.cpp
@@ -35,7 +35,7 @@ protected:
         sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset - 30);
 
         // build
-        fBlob.reset(builder.build());
+        fBlob = builder.make();
     }
 
     SkString onShortName() override {
@@ -77,7 +77,7 @@ protected:
     }
 
 private:
-    SkAutoTUnref<const SkTextBlob> fBlob;
+    sk_sp<SkTextBlob> fBlob;
 
     static constexpr int kWidth = 275;
     static constexpr int kHeight = 200;