[svg] TearOffs dynamically hold on to the current contextElement().

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 58 matching lines @@
     ASSERT(propertyId > 0);
     propertyNameToIdMap->set(attrName.localName().impl(), propertyId);
 }
 
 SVGElement::SVGElement(const QualifiedName& tagName, Document& document, ConstructionType constructionType)
     : Element(tagName, &document, constructionType)
 #if !ASSERT_DISABLED
     , m_inRelativeLengthClientsInvalidation(false)
 #endif
     , m_animatedPropertiesDestructed(false)
+    , m_isContextElement(false)
 {
     ScriptWrappable::init(this);
     registerAnimatedPropertiesForSVGElement();
     setHasCustomStyleCallbacks();
 }
 
 SVGElement::~SVGElement()
 {
     ASSERT(inDocument() || !hasRelativeLengths());
 }
@@ skipping 1095 matching lines @@
     }
 
     if (name == classAttr)
         return true;
 
     return animatableAttributes.contains(name);
 }
 #endif
 
 }