Update SkMergeImageFilter to sk_sp

src/effects/SkAlphaThresholdFilter.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 "SkAlphaThresholdFilter.h"
 #include "SkBitmap.h"
 #include "SkDevice.h"
@@ skipping 251 matching lines @@
 }
 
 #endif
 
 SkFlattenable* SkAlphaThresholdFilterImpl::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkScalar inner = buffer.readScalar();
     SkScalar outer = buffer.readScalar();
     SkRegion rgn;
     buffer.readRegion(&rgn);
-    return SkAlphaThresholdFilter::Create(rgn, inner, outer, common.getInput(0));
+    return SkAlphaThresholdFilter::Create(rgn, inner, outer, common.getInput(0).get());
 }
 
 SkAlphaThresholdFilterImpl::SkAlphaThresholdFilterImpl(const SkRegion& region,
                                                        SkScalar innerThreshold,
                                                        SkScalar outerThreshold,
                                                        SkImageFilter* input)
     : INHERITED(1, &input)
     , fRegion(region)
     , fInnerThreshold(innerThreshold)
     , fOuterThreshold(outerThreshold) {
@@ skipping 120 matching lines @@
     return true;
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkAlphaThresholdFilterImpl::toString(SkString* str) const {
     str->appendf("SkAlphaThresholdImageFilter: (");
     str->appendf("inner: %f outer: %f", fInnerThreshold, fOuterThreshold);
     str->append(")");
 }
 #endif