change flattenable factory to return sk_sp

src/effects/SkArithmeticMode.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkArithmeticMode.h"
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
@@ skipping 36 matching lines @@
     }
 
     SkScalar fK[4];
     bool fEnforcePMColor;
 
     friend class SkArithmeticMode;
 
     typedef SkXfermode INHERITED;
 };
 
-SkFlattenable* SkArithmeticMode_scalar::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkArithmeticMode_scalar::CreateProc(SkReadBuffer& buffer) {
     const SkScalar k1 = buffer.readScalar();
     const SkScalar k2 = buffer.readScalar();
     const SkScalar k3 = buffer.readScalar();
     const SkScalar k4 = buffer.readScalar();
     const bool enforcePMColor = buffer.readBool();
-    return SkArithmeticMode::Make(k1, k2, k3, k4, enforcePMColor).release();
+    return SkArithmeticMode::Make(k1, k2, k3, k4, enforcePMColor);
 }
 
 static int pinToByte(int value) {
     if (value < 0) {
         value = 0;
     } else if (value > 255) {
         value = 255;
     }
     return value;
 }
@@ skipping 95 matching lines @@
                                          SkScalarToFloat(fK[2]),
                                          SkScalarToFloat(fK[3]),
                                          fEnforcePMColor);
 }
 
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkArithmeticMode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkArithmeticMode_scalar)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END