src/core: s/SkAutoTUnref/sk_sp/g

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4492

Change-Id: I753ad01b03e891221965252e3befe280d09cdb9f
Reviewed-on: https://skia-review.googlesource.com/4492
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/src/core/SkBitmapController.cpp b/src/core/SkBitmapController.cpp
index f4ee0fb..ffeb10c 100644
--- a/src/core/SkBitmapController.cpp
+++ b/src/core/SkBitmapController.cpp
@@ -48,9 +48,9 @@
                                    SkSourceGammaTreatment);
 
 private:
-    SkBitmap                     fResultBitmap;
-    SkSourceGammaTreatment       fSrcGammaTreatment;
-    SkAutoTUnref<const SkMipMap> fCurrMip;
+    SkBitmap               fResultBitmap;
+    SkSourceGammaTreatment fSrcGammaTreatment;
+    sk_sp<const SkMipMap>  fCurrMip;
 
     bool processHQRequest(const SkBitmapProvider&);
     bool processMediumRequest(const SkBitmapProvider&);