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

tests/CodecPriv.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCodec.h"
 #include "SkData.h"
 
 inline bool decode_memory(const void* mem, size_t size, SkBitmap* bm) {
-    sk_sp<SkData> data(SkData::MakeWithoutCopy(mem, size));
-
-    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(data.get()));
+    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(SkData::MakeWithoutCopy(mem, size)));
     if (!codec) {
         return false;
     }
 
     // Construct a color table for the decode if necessary
     SkAutoTUnref<SkColorTable> colorTable(nullptr);
     SkPMColor* colorPtr = nullptr;
     int* colorCountPtr = nullptr;
     int maxColors = 256;
     if (kIndex_8_SkColorType == codec->getInfo().colorType()) {
         SkPMColor colors[256];
         colorTable.reset(new SkColorTable(colors, maxColors));
         colorPtr = const_cast<SkPMColor*>(colorTable->readColors());
         colorCountPtr = &maxColors;
     }
 
     bm->allocPixels(codec->getInfo(), nullptr, colorTable.get());
     const SkCodec::Result result = codec->getPixels(codec->getInfo(), bm->getPixels(),
             bm->rowBytes(), nullptr, colorPtr, colorCountPtr);
     return result == SkCodec::kSuccess || result == SkCodec::kIncompleteInput;
 }