change flattenable factory to return sk_sp

src/effects/SkArcToPathEffect.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 "SkArcToPathEffect.h"
 #include "SkPath.h"
 #include "SkPoint.h"
@@ skipping 43 matching lines @@
             case SkPath::kDone_Verb:
                 dst->lineTo(lastCorner);
                 goto DONE;
         }
         prevVerb = verb;
     }
 DONE:
     return true;
 }
 
-SkFlattenable* SkArcToPathEffect::CreateProc(SkReadBuffer& buffer) {
-    return SkArcToPathEffect::Make(buffer.readScalar()).release();
+sk_sp<SkFlattenable> SkArcToPathEffect::CreateProc(SkReadBuffer& buffer) {
+    return SkArcToPathEffect::Make(buffer.readScalar());
 }
 
 void SkArcToPathEffect::flatten(SkWriteBuffer& buffer) const {
     buffer.writeScalar(fRadius);
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkArcToPathEffect::toString(SkString* str) const {
     str->appendf("SkArcToPathEffect: (");
     str->appendf("radius: %f", fRadius);
     str->appendf(")");
 }
 #endif