Make sp variants for SkData

src/images/SkImageDecoder_pkm.cpp

Index: src/images/SkImageDecoder_pkm.cpp
diff --git a/src/images/SkImageDecoder_pkm.cpp b/src/images/SkImageDecoder_pkm.cpp
index 098a4ee0aee44b6d80d3e35e1916be94a6c54f85..af68f20d9775fea69a11ff7d85f096d7c2de6361 100644
--- a/src/images/SkImageDecoder_pkm.cpp
+++ b/src/images/SkImageDecoder_pkm.cpp
@@ -34,7 +34,7 @@ private:
 /////////////////////////////////////////////////////////////////////////////////////////
 
 SkImageDecoder::Result SkPKMImageDecoder::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
-    SkAutoTUnref<SkData> data(SkCopyStreamToData(stream));
+    sk_sp<SkData> data(SkCopyStreamToData(stream));
     if (!data || !data->size()) {
         return kFailure;
     }