Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGURIReference.cpp

 /*
  * Copyright (C) 2004, 2005, 2008 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 16 matching lines @@
 
 namespace blink {
 
 SVGURIReference::SVGURIReference(SVGElement* element)
     : m_href(SVGAnimatedString::create(element, XLinkNames::hrefAttr, SVGString::create()))
 {
     ASSERT(element);
     element->addToPropertyMap(m_href);
 }
 
+void SVGURIReference::trace(Visitor* visitor)
+{
+    visitor->trace(m_href);
+}
+
 bool SVGURIReference::isKnownAttribute(const QualifiedName& attrName)
 {
     return attrName.matches(XLinkNames::hrefAttr);
 }
 
 AtomicString SVGURIReference::fragmentIdentifierFromIRIString(const String& url, const TreeScope& treeScope)
 {
     size_t start = url.find('#');
     if (start == kNotFound)
         return emptyAtom;
@@ skipping 52 matching lines @@
 
     return treeScope.getElementById(id);
 }
 
 void SVGURIReference::addSupportedAttributes(HashSet<QualifiedName>& supportedAttributes)
 {
     supportedAttributes.add(XLinkNames::hrefAttr);
 }
 
 }