Remove SVGElementInstance

Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * 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
@@ skipping 89 matching lines @@
         m_SVGRareData.clear();
     }
 
     // With Oilpan, either removedFrom has been called or the document is dead
     // as well and there is no reason to clear out the extensions.
     document().accessSVGExtensions().rebuildAllElementReferencesForTarget(this);
     document().accessSVGExtensions().removeAllElementReferencesForTarget(this);
 #endif
 }
 
+void SVGElement::detach(const AttachContext& context)
+{
+    Element::detach(context);
+    if (correspondingElement() && correspondingElement()->instancesForElement().contains(this))

[pdr., 2014/06/04 04:07:52]

Can we make instancesForElement protected and move the contains logic into
removeInstanceMapping?

+        correspondingElement()->removeInstanceMapping(this);
+}
+
+void SVGElement::attach(const AttachContext& context)
+{
+    Element::attach(context);
+    if (correspondingElement())
+        correspondingElement()->mapInstanceToElement(this);
+}
+
 short SVGElement::tabIndex() const
 {
     if (supportsFocus())
         return Element::tabIndex();
     return -1;
 }
 
 void SVGElement::willRecalcStyle(StyleRecalcChange change)
 {
     if (!hasSVGRareData())
@@ skipping 915 matching lines @@
     const WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >::const_iterator end = set.end();
     for (WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >::const_iterator it = set.begin(); it != end; ++it) {
         (*it)->setCorrespondingElement(0);
 
         if (SVGUseElement* element = (*it)->correspondingUseElement()) {
             ASSERT(element->inDocument());
             element->invalidateShadowTree();
         }
     }
 
+    svgRareData()->elementInstances().clear();
+
     document().updateRenderTreeIfNeeded();
 }
 
 SVGElement::InstanceUpdateBlocker::InstanceUpdateBlocker(SVGElement* targetElement)
     : m_targetElement(targetElement)
 {
     if (m_targetElement)
         m_targetElement->setInstanceUpdatesBlocked(true);
 }
 
@@ skipping 111 matching lines @@
 #endif
 
 void SVGElement::trace(Visitor* visitor)
 {
     visitor->trace(m_elementsWithRelativeLengths);
     visitor->trace(m_SVGRareData);
     Element::trace(visitor);
 }
 
 }