Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGFEDropShadowElement.cpp

Index: Source/core/svg/SVGFEDropShadowElement.cpp
diff --git a/Source/core/svg/SVGFEDropShadowElement.cpp b/Source/core/svg/SVGFEDropShadowElement.cpp
index f424bd605c3e2ead0537f93beb8da852ebd2a351..440fcbaea7ca02f90e64066a25ac806578969b03 100644
--- a/Source/core/svg/SVGFEDropShadowElement.cpp
+++ b/Source/core/svg/SVGFEDropShadowElement.cpp
@@ -42,6 +42,15 @@ inline SVGFEDropShadowElement::SVGFEDropShadowElement(Document& document)
     addToPropertyMap(m_in1);
 }
 
+void SVGFEDropShadowElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_dx);
+    visitor->trace(m_dy);
+    visitor->trace(m_stdDeviation);
+    visitor->trace(m_in1);
+    SVGFilterPrimitiveStandardAttributes::trace(visitor);
+}
+
 DEFINE_NODE_FACTORY(SVGFEDropShadowElement)
 
 void SVGFEDropShadowElement::setStdDeviation(float x, float y)
@@ -88,7 +97,7 @@ void SVGFEDropShadowElement::svgAttributeChanged(const QualifiedName& attrName)
     ASSERT_NOT_REACHED();
 }
 
-PassRefPtr<FilterEffect> SVGFEDropShadowElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
+PassRefPtrWillBeRawPtr<FilterEffect> SVGFEDropShadowElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
 {
     RenderObject* renderer = this->renderer();
     if (!renderer)
@@ -107,7 +116,7 @@ PassRefPtr<FilterEffect> SVGFEDropShadowElement::build(SVGFilterBuilder* filterB
     if (!input1)
         return nullptr;
 
-    RefPtr<FilterEffect> effect = FEDropShadow::create(filter, stdDeviationX()->currentValue()->value(), stdDeviationY()->currentValue()->value(), m_dx->currentValue()->value(), m_dy->currentValue()->value(), color, opacity);
+    RefPtrWillBeRawPtr<FilterEffect> effect = FEDropShadow::create(filter, stdDeviationX()->currentValue()->value(), stdDeviationY()->currentValue()->value(), m_dx->currentValue()->value(), m_dy->currentValue()->value(), color, opacity);
     effect->inputEffects().append(input1);
     return effect.release();
 }