bench, samples, etc: s/SkAutoTUnref/sk_sp/

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4437

Change-Id: Ice071684ac8a99e4bb405b4b9be8e8f42c7bac42
Reviewed-on: https://skia-review.googlesource.com/4437
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/bench/SKPBench.h b/bench/SKPBench.h
index 1f34a00..2874bff 100644
--- a/bench/SKPBench.h
+++ b/bench/SKPBench.h
@@ -42,12 +42,12 @@
     virtual void drawMPDPicture();
     virtual void drawPicture();
 
-    const SkPicture* picture() const { return fPic; }
+    const SkPicture* picture() const { return fPic.get(); }
     const SkTDArray<SkSurface*>& surfaces() const { return fSurfaces; }
     const SkTDArray<SkIRect>& tileRects() const { return fTileRects; }
 
 private:
-    SkAutoTUnref<const SkPicture> fPic;
+    sk_sp<const SkPicture> fPic;
     const SkIRect fClip;
     const SkScalar fScale;
     SkString fName;