Update SkMergeImageFilter to sk_sp

src/effects/SkComposeImageFilter.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 "SkComposeImageFilter.h"
 
 #include "SkReadBuffer.h"
@@ skipping 42 matching lines @@
 SkIRect SkComposeImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
                                              MapDirection direction) const {
     SkImageFilter* outer = this->getInput(0);
     SkImageFilter* inner = this->getInput(1);
 
     return outer->filterBounds(inner->filterBounds(src, ctm, direction), ctm, direction);
 }
 
 SkFlattenable* SkComposeImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
-    return SkComposeImageFilter::Make(sk_ref_sp<SkImageFilter>(common.getInput(0)),
-                                      sk_ref_sp<SkImageFilter>(common.getInput(1))).release();
+    return SkComposeImageFilter::Make(common.getInput(0), common.getInput(1)).release();
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkComposeImageFilter::toString(SkString* str) const {
     SkImageFilter* outer = getInput(0);
     SkImageFilter* inner = getInput(1);
 
     str->appendf("SkComposeImageFilter: (");
 
     str->appendf("outer: ");
     outer->toString(str);
 
     str->appendf("inner: ");
     inner->toString(str);
 
     str->appendf(")");
 }
 #endif