Remove m_isContextElement

Source/core/svg/SVGElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009, 2014 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 230 matching lines @@
     void buildPendingResourcesIfNeeded();
 
     WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> > m_elementsWithRelativeLengths;
 
     typedef HashMap<QualifiedName, RefPtr<SVGAnimatedPropertyBase> > AttributeToPropertyMap;
     AttributeToPropertyMap m_attributeToPropertyMap;
 
 #if ENABLE(ASSERT)
     bool m_inRelativeLengthClientsInvalidation;
 #endif
-    unsigned m_isContextElement : 1;
 
     OwnPtrWillBeMember<SVGElementRareData> m_SVGRareData;
     RefPtr<SVGAnimatedString> m_className;
 };
 
 struct SVGAttributeHashTranslator {
     static unsigned hash(const QualifiedName& key)
     {
         if (key.hasPrefix()) {
             QualifiedNameComponents components = { nullAtom.impl(), key.localName().impl(), key.namespaceURI().impl() };
@@ skipping 24 matching lines @@
     template<typename T> inline bool is##thisType(const PassRefPtr<T>& node) { return is##thisType(node.get()); } \
     template<typename T> inline bool is##thisType(const RefPtr<T>& node) { return is##thisType(node.get()); } \
     template <> inline bool isElementOfType<const thisType>(const SVGElement& element) { return is##thisType(element); } \
     DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType)
 
 }
 
 #include "core/SVGElementTypeHelpers.h"
 
 #endif