Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGFEMergeElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 19 matching lines @@
 
 namespace blink {
 
 inline SVGFEMergeElement::SVGFEMergeElement(Document& document)
     : SVGFilterPrimitiveStandardAttributes(SVGNames::feMergeTag, document)
 {
 }
 
 DEFINE_NODE_FACTORY(SVGFEMergeElement)
 
-PassRefPtr<FilterEffect> SVGFEMergeElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
+PassRefPtrWillBeRawPtr<FilterEffect> SVGFEMergeElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
 {
-    RefPtr<FilterEffect> effect = FEMerge::create(filter);
+    RefPtrWillBeRawPtr<FilterEffect> effect = FEMerge::create(filter);
     FilterEffectVector& mergeInputs = effect->inputEffects();
     for (SVGFEMergeNodeElement* element = Traversal<SVGFEMergeNodeElement>::firstChild(*this); element; element = Traversal<SVGFEMergeNodeElement>::nextSibling(*element)) {
         FilterEffect* mergeEffect = filterBuilder->getEffectById(AtomicString(element->in1()->currentValue()->value()));
         if (!mergeEffect)
             return nullptr;
         mergeInputs.append(mergeEffect);
     }
 
     if (mergeInputs.isEmpty())
         return nullptr;
 
     return effect.release();
 }
 
 }