Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGAElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * 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.
@@ skipping 44 matching lines @@
 
 inline SVGAElement::SVGAElement(Document& document)
     : SVGGraphicsElement(SVGNames::aTag, document)
     , SVGURIReference(this)
     , m_svgTarget(SVGAnimatedString::create(this, SVGNames::targetAttr, SVGString::create()))
     , m_wasFocusedByMouse(false)
 {
     addToPropertyMap(m_svgTarget);
 }
 
+void SVGAElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_svgTarget);
+    SVGGraphicsElement::trace(visitor);
+    SVGURIReference::trace(visitor);
+}
+
 DEFINE_NODE_FACTORY(SVGAElement)
 
 String SVGAElement::title() const
 {
     // If the xlink:title is set (non-empty string), use it.
     const AtomicString& title = fastGetAttribute(XLinkNames::titleAttr);
     if (!title.isEmpty())
         return title;
 
     // Otherwise, use the title of this element.
@@ skipping 126 matching lines @@
         return SVGElement::canStartSelection();
     return hasEditableStyle();
 }
 
 bool SVGAElement::willRespondToMouseClickEvents()
 {
     return isLink() || SVGGraphicsElement::willRespondToMouseClickEvents();
 }
 
 } // namespace blink