Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGPathSeg.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #include "config.h"
 #include "core/svg/SVGPathSeg.h"
 
 #include "core/svg/SVGPathElement.h"
 
 namespace blink {
 
 SVGPathSeg::SVGPathSeg(SVGPathElement* contextElement)
-    : m_ownerList(0)
+    : m_ownerList(nullptr)
     , m_contextElement(contextElement)
 {
 }
 
+void SVGPathSeg::trace(Visitor* visitor)
+{
+    visitor->trace(m_ownerList);
+    visitor->trace(m_contextElement);
+}
+
 void SVGPathSeg::commitChange()
 {
     if (m_contextElement)
         toSVGPathElement(m_contextElement)->pathSegListChanged();
 }
 
 }