Convert SkAutoTUnref<SkData> to sk_sp<SkData>.

src/image/SkImage.cpp

Index: src/image/SkImage.cpp
diff --git a/src/image/SkImage.cpp b/src/image/SkImage.cpp
index 8e4640755c1120e710db6752a5d7daf7ad7eb61a..15c5ea6bd82f38c670e2592272c097e5dff1f123 100644
--- a/src/image/SkImage.cpp
+++ b/src/image/SkImage.cpp
@@ -134,7 +134,7 @@ SkData* SkImage::encode(SkPixelSerializer* serializer) const {
         SkASSERT(defaultSerializer.get());
         effectiveSerializer = defaultSerializer.get();
     }
-    SkAutoTUnref<SkData> encoded(this->refEncoded());
+    sk_sp<SkData> encoded(this->refEncoded());
     if (encoded && effectiveSerializer->useEncodedData(encoded->data(), encoded->size())) {
         return encoded.release();
     }