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

src/images/SkImageEncoder.cpp

 /*
  * Copyright 2009 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageEncoder.h"
 #include "SkBitmap.h"
 #include "SkPixelSerializer.h"
@@ skipping 13 matching lines @@
                                 int quality) {
     quality = SkMin32(100, SkMax32(0, quality));
     SkFILEWStream   stream(file);
     return this->onEncode(&stream, bm, quality);
 }
 
 SkData* SkImageEncoder::encodeData(const SkBitmap& bm, int quality) {
     SkDynamicMemoryWStream stream;
     quality = SkMin32(100, SkMax32(0, quality));
     if (this->onEncode(&stream, bm, quality)) {
-        return stream.copyToData();
+        return stream.detachAsData().release();
     }
     return nullptr;
 }
 
 bool SkImageEncoder::EncodeFile(const char file[], const SkBitmap& bm, Type t,
                                 int quality) {
     SkAutoTDelete<SkImageEncoder> enc(SkImageEncoder::Create(t));
     return enc.get() && enc.get()->encodeFile(file, bm, quality);
 }
 
@@ skipping 34 matching lines @@
     bool onUseEncodedData(const void*, size_t) override { return true; }
     SkData* onEncode(const SkPixmap& pmap) override {
         return SkImageEncoder::EncodeData(pmap, SkImageEncoder::kPNG_Type, 100);
     }
 };
 } // namespace
 
 SkPixelSerializer* SkImageEncoder::CreatePixelSerializer() {
     return new ImageEncoderPixelSerializer;
 }