Update SkMergeImageFilter to sk_sp

src/core/SkLocalMatrixImageFilter.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkLocalMatrixImageFilter.h"
 #include "SkReadBuffer.h"
 #include "SkSpecialImage.h"
 #include "SkString.h"
 
 SkLocalMatrixImageFilter::SkLocalMatrixImageFilter(const SkMatrix& localM,
                                                    sk_sp<SkImageFilter> input)
     : INHERITED(&input, 1, nullptr)
     , fLocalM(localM) {
 }
 
 SkFlattenable* SkLocalMatrixImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkMatrix lm;
     buffer.readMatrix(&lm);
-    return SkLocalMatrixImageFilter::Make(lm,
-                                          sk_ref_sp<SkImageFilter>(common.getInput(0))).release();
+    return SkLocalMatrixImageFilter::Make(lm, common.getInput(0)).release();
 }
 
 void SkLocalMatrixImageFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeMatrix(fLocalM);
 }
 
 sk_sp<SkSpecialImage> SkLocalMatrixImageFilter::onFilterImage(SkSpecialImage* source,
                                                               const Context& ctx,
                                                               SkIPoint* offset) const {
     Context localCtx(SkMatrix::Concat(ctx.ctm(), fLocalM), ctx.clipBounds(), ctx.cache());
     return this->filterInput(0, source, localCtx, offset);
 }
 
 SkIRect SkLocalMatrixImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& matrix,
                                                  MapDirection direction) const {
     return this->getInput(0)->filterBounds(src, SkMatrix::Concat(matrix, fLocalM), direction);
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkLocalMatrixImageFilter::toString(SkString* str) const {
     str->append("SkLocalMatrixImageFilter: (");
     str->append(")");
 }
 #endif