change flattenable factory to return sk_sp

src/core/SkXfermode.cpp

 /*
  * Copyright 2006 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 "SkXfermode.h"
 #include "SkXfermode_proccoeff.h"
 #include "SkColorPriv.h"
@@ skipping 1074 matching lines @@
     return false;
 }
 
 bool SkXfermode::isOpaque(SkXfermode::SrcColorOpacity opacityType) const {
     return false;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 
-SkFlattenable* SkProcCoeffXfermode::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkProcCoeffXfermode::CreateProc(SkReadBuffer& buffer) {
     uint32_t mode32 = buffer.read32();
     if (!buffer.validate(mode32 < SK_ARRAY_COUNT(gProcCoeffs))) {
         return nullptr;
     }
-    return SkXfermode::Make((SkXfermode::Mode)mode32).release();
+    return SkXfermode::Make((SkXfermode::Mode)mode32);
 }
 
 void SkProcCoeffXfermode::flatten(SkWriteBuffer& buffer) const {
     buffer.write32(fMode);
 }
 
 bool SkProcCoeffXfermode::asMode(Mode* mode) const {
     if (mode) {
         *mode = fMode;
     }
@@ skipping 299 matching lines @@
     if (!xfer) {
         return SkXfermode::kOpaque_SrcColorOpacity == opacityType;
     }
 
     return xfer->isOpaque(opacityType);
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkXfermode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkProcCoeffXfermode)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END