Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGRadialGradientElement.cpp

Index: Source/core/svg/SVGRadialGradientElement.cpp
diff --git a/Source/core/svg/SVGRadialGradientElement.cpp b/Source/core/svg/SVGRadialGradientElement.cpp
index 1404a9f1abe92968d895a11e63f7426b91a3feef..4259fbb84bf78fdeb0976cb11cc56684848b621c 100644
--- a/Source/core/svg/SVGRadialGradientElement.cpp
+++ b/Source/core/svg/SVGRadialGradientElement.cpp
@@ -56,6 +56,17 @@ inline SVGRadialGradientElement::SVGRadialGradientElement(Document& document)
     addToPropertyMap(m_fr);
 }
 
+void SVGRadialGradientElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_cx);
+    visitor->trace(m_cy);
+    visitor->trace(m_r);
+    visitor->trace(m_fx);
+    visitor->trace(m_fy);
+    visitor->trace(m_fr);
+    SVGGradientElement::trace(visitor);
+}
+
 DEFINE_NODE_FACTORY(SVGRadialGradientElement)
 
 bool SVGRadialGradientElement::isSupportedAttribute(const QualifiedName& attrName)