change flattenable factory to return sk_sp

src/core/SkLocalMatrixShader.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkLocalMatrixShader.h"
 
-SkFlattenable* SkLocalMatrixShader::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkLocalMatrixShader::CreateProc(SkReadBuffer& buffer) {
     SkMatrix lm;
     buffer.readMatrix(&lm);
     auto baseShader(buffer.readShader());
     if (!baseShader) {
         return nullptr;
     }
-    return baseShader->makeWithLocalMatrix(lm).release();
+    return baseShader->makeWithLocalMatrix(lm);
 }
 
 void SkLocalMatrixShader::flatten(SkWriteBuffer& buffer) const {
     buffer.writeMatrix(this->getLocalMatrix());
     buffer.writeFlattenable(fProxyShader.get());
 }
 
 SkShader::Context* SkLocalMatrixShader::onCreateContext(const ContextRec& rec,
                                                         void* storage) const {
     ContextRec newRec(rec);
@@ skipping 30 matching lines @@
     SkMatrix otherLocalMatrix;
     SkAutoTUnref<SkShader> proxy(this->refAsALocalMatrixShader(&otherLocalMatrix));
     if (proxy) {
         otherLocalMatrix.preConcat(localMatrix);
         lm = &otherLocalMatrix;
         baseShader = proxy.get();
     }
 
     return sk_make_sp<SkLocalMatrixShader>(baseShader, *lm);
 }