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/rrects.cpp b/gm/rrects.cpp
index c252ec6..29e81bd 100644
--- a/gm/rrects.cpp
+++ b/gm/rrects.cpp
@@ -115,10 +115,10 @@
                             SkRect bounds = rrect.getBounds();
                             bounds.outset(2.f, 2.f);
 
-                            SkAutoTUnref<GrDrawBatch> batch(
+                            sk_sp<GrDrawBatch> batch(
                                     GrRectBatchFactory::CreateNonAAFill(0xff000000, SkMatrix::I(),
                                                                         bounds, nullptr, nullptr));
-                            renderTargetContext->priv().testingOnly_drawBatch(grPaint, batch);
+                            renderTargetContext->priv().testingOnly_drawBatch(grPaint, batch.get());
                         } else {
                             drew = false;
                         }