s/SkAutoTUnref/sk_sp/ in src/ part 1

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4480

Change-Id: I7d3219b02ad5094785e1b7635a9482e69aadbc8c
Reviewed-on: https://skia-review.googlesource.com/4480
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/src/android/SkBitmapRegionCodec.cpp b/src/android/SkBitmapRegionCodec.cpp
index 7c51fc8..973e3c9 100644
--- a/src/android/SkBitmapRegionCodec.cpp
+++ b/src/android/SkBitmapRegionCodec.cpp
@@ -60,7 +60,7 @@
                                                dstColorType, dstAlphaType, colorSpace);
 
     // Construct a color table for the decode if necessary
-    SkAutoTUnref<SkColorTable> colorTable(nullptr);
+    sk_sp<SkColorTable> colorTable(nullptr);
     int maxColors = 256;
     SkPMColor colors[256];
     if (kIndex_8_SkColorType == dstColorType) {