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

src/codec/SkCodecImageGenerator.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #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;
     }
 
     return new SkCodecImageGenerator(codec, data);
 }
 
 static SkImageInfo make_premul(const SkImageInfo& info) {
     if (kUnpremul_SkAlphaType == info.alphaType()) {
         return info.makeAlphaType(kPremul_SkAlphaType);
     }
 
     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) {
     return SkRef(fData.get());
 }
 
 bool SkCodecImageGenerator::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
         SkPMColor ctable[], int* ctableCount) {
 
     // FIXME (msarett):
@@ skipping 21 matching lines @@
     SkCodec::Result result = fCodec->getYUV8Planes(sizeInfo, planes);
 
     switch (result) {
         case SkCodec::kSuccess:
         case SkCodec::kIncompleteInput:
             return true;
         default:
             return false;
     }
 }