Make sp variants for SkData

src/images/SkImageDecoder_libico.cpp

Index: src/images/SkImageDecoder_libico.cpp
diff --git a/src/images/SkImageDecoder_libico.cpp b/src/images/SkImageDecoder_libico.cpp
index 93a875d4cbcd7b691a63d589f5a7faf0e4c8e272..ff04d74d066f936b941602f9cd5b34972a29e528 100644
--- a/src/images/SkImageDecoder_libico.cpp
+++ b/src/images/SkImageDecoder_libico.cpp
@@ -73,9 +73,8 @@ static int calculateRowBytesFor8888(int w, int bitCount)
     return 0;
 }
 
-SkImageDecoder::Result SkICOImageDecoder::onDecode(SkStream* stream, SkBitmap* bm, Mode mode)
-{
-    SkAutoTUnref<SkData> data(SkCopyStreamToData(stream));
+SkImageDecoder::Result SkICOImageDecoder::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
+    auto data = SkCopyStreamToData(stream);
     if (!data) {
         return kFailure;
     }