change SkStreams to work with sk_sp<SkData> instead of SkData*

src/codec/SkCodecImageGenerator.cpp

Index: src/codec/SkCodecImageGenerator.cpp
diff --git a/src/codec/SkCodecImageGenerator.cpp b/src/codec/SkCodecImageGenerator.cpp
index 1bae1df856e1f5c8ca7a5a02b0ead1ddb72b976f..8108f0de441c64744faf5f6ffe9626798c027356 100644
--- a/src/codec/SkCodecImageGenerator.cpp
+++ b/src/codec/SkCodecImageGenerator.cpp
@@ -7,7 +7,7 @@
 
 #include "SkCodecImageGenerator.h"
 
-SkImageGenerator* SkCodecImageGenerator::NewFromEncodedCodec(SkData* data) {
+SkImageGenerator* SkCodecImageGenerator::NewFromEncodedCodec(sk_sp<SkData> data) {
     SkCodec* codec = SkCodec::NewFromData(data);
     if (nullptr == codec) {
         return nullptr;
@@ -24,10 +24,10 @@ static SkImageInfo make_premul(const SkImageInfo& info) {
     return info;
 }
 
-SkCodecImageGenerator::SkCodecImageGenerator(SkCodec* codec, SkData* data)
+SkCodecImageGenerator::SkCodecImageGenerator(SkCodec* codec, sk_sp<SkData> data)
     : INHERITED(make_premul(codec->getInfo()))
     , fCodec(codec)
-    , fData(SkRef(data))
+    , fData(std::move(data))
 {}
 
 SkData* SkCodecImageGenerator::onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM) {