Update DownSampleImageFilter to sk_sp

src/effects/SkTestImageFilters.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTestImageFilters.h"
 #include "SkCanvas.h"
 #include "SkReadBuffer.h"
@@ skipping 64 matching lines @@
 
         canvas->scale(SkScalarInvert(fScale), SkScalarInvert(fScale));
         tmp->draw(canvas, 0, 0, &paint);
 
         return surf->makeImageSnapshot();
     }
 }
 
 sk_sp<SkFlattenable> SkDownSampleImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
-    return sk_sp<SkFlattenable>(Create(buffer.readScalar(), common.getInput(0).get()));
+    return Make(buffer.readScalar(), common.getInput(0));
 }
 
 void SkDownSampleImageFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeScalar(fScale);
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkDownSampleImageFilter::toString(SkString* str) const {
     str->appendf("SkDownSampleImageFilter: (");
     str->append(")");
 }
 #endif