Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGFEBlendElement.cpp

Index: Source/core/svg/SVGFEBlendElement.cpp
diff --git a/Source/core/svg/SVGFEBlendElement.cpp b/Source/core/svg/SVGFEBlendElement.cpp
index 2bfc08023f1beec848358df1e429b0a607f44c1f..3dab3fc951d13f2da8e45035700e18583776b521 100644
--- a/Source/core/svg/SVGFEBlendElement.cpp
+++ b/Source/core/svg/SVGFEBlendElement.cpp
@@ -99,6 +99,14 @@ inline SVGFEBlendElement::SVGFEBlendElement(Document& document)
     addToPropertyMap(m_mode);
 }
 
+void SVGFEBlendElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_in1);
+    visitor->trace(m_in2);
+    visitor->trace(m_mode);
+    SVGFilterPrimitiveStandardAttributes::trace(visitor);
+}
+
 DEFINE_NODE_FACTORY(SVGFEBlendElement)
 
 bool SVGFEBlendElement::isSupportedAttribute(const QualifiedName& attrName)
@@ -149,7 +157,7 @@ void SVGFEBlendElement::svgAttributeChanged(const QualifiedName& attrName)
     ASSERT_NOT_REACHED();
 }
 
-PassRefPtr<FilterEffect> SVGFEBlendElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
+PassRefPtrWillBeRawPtr<FilterEffect> SVGFEBlendElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
 {
     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
     FilterEffect* input2 = filterBuilder->getEffectById(AtomicString(m_in2->currentValue()->value()));
@@ -157,7 +165,7 @@ PassRefPtr<FilterEffect> SVGFEBlendElement::build(SVGFilterBuilder* filterBuilde
     if (!input1 || !input2)
         return nullptr;
 
-    RefPtr<FilterEffect> effect = FEBlend::create(filter, toWebBlendMode(m_mode->currentValue()->enumValue()));
+    RefPtrWillBeRawPtr<FilterEffect> effect = FEBlend::create(filter, toWebBlendMode(m_mode->currentValue()->enumValue()));
     FilterEffectVector& inputEffects = effect->inputEffects();
     inputEffects.reserveCapacity(2);
     inputEffects.append(input1);