change flattenable factory to return sk_sp

src/utils/SkBitmapSourceDeserializer.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 "SkBitmapSourceDeserializer.h"
 
 #include "SkBitmap.h"
 #include "SkFilterQuality.h"
 #include "SkImage.h"
 #include "SkImageSource.h"
 #include "SkReadBuffer.h"
 
-SkFlattenable* SkBitmapSourceDeserializer::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkBitmapSourceDeserializer::CreateProc(SkReadBuffer& buffer) {
     SkFilterQuality filterQuality;
     if (buffer.isVersionLT(SkReadBuffer::kBitmapSourceFilterQuality_Version)) {
         filterQuality = kHigh_SkFilterQuality;
     } else {
         filterQuality = (SkFilterQuality)buffer.readInt();
     }
     SkRect src, dst;
     buffer.readRect(&src);
     buffer.readRect(&dst);
     SkBitmap bitmap;
     if (!buffer.readBitmap(&bitmap)) {
         return nullptr;
     }
     bitmap.setImmutable();
 
-    return SkImageSource::Make(SkImage::MakeFromBitmap(bitmap), src, dst, filterQuality).release();
+    return SkImageSource::Make(SkImage::MakeFromBitmap(bitmap), src, dst, filterQuality);
 }