Remove dead code from childIndex optimization

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013 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
@@ skipping 332 matching lines @@
 
     RenderStyle* computedStyle(PseudoId = NOPSEUDO);
 
     // Methods for indicating the style is affected by dynamic updates (e.g., children changing, our position changing in our sibling list, etc.)
     bool styleAffectedByEmpty() const { return hasElementFlag(StyleAffectedByEmpty); }
     void setStyleAffectedByEmpty() { setElementFlag(StyleAffectedByEmpty); }
 
     void setIsInCanvasSubtree(bool value) { setElementFlag(IsInCanvasSubtree, value); }
     bool isInCanvasSubtree() const { return hasElementFlag(IsInCanvasSubtree); }
 
-    unsigned childIndex() const { return hasRareData() ? rareDataChildIndex() : 0; }
-    void setChildIndex(unsigned);
-
     bool isUpgradedCustomElement() { return customElementState() == Upgraded; }
     bool isUnresolvedCustomElement() { return customElementState() == WaitingForUpgrade; }
 
     AtomicString computeInheritedLanguage() const;
     Locale& locale() const;
 
     virtual void accessKeyAction(bool /*sendToAnyEvent*/) { }
 
     virtual bool isURLAttribute(const Attribute&) const { return false; }
     virtual bool isHTMLContentAttribute(const Attribute&) const { return false; }
@@ skipping 260 matching lines @@
     inline void removeCallbackSelectors();
     inline void addCallbackSelectors();
 
     // cloneNode is private so that non-virtual cloneElementWithChildren and cloneElementWithoutChildren
     // are used instead.
     virtual PassRefPtr<Node> cloneNode(bool deep) OVERRIDE;
     virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren();
 
     QualifiedName m_tagName;
 
-    unsigned rareDataChildIndex() const;
-
     SpellcheckAttributeState spellcheckAttributeState() const;
 
     void updateNamedItemRegistration(const AtomicString& oldName, const AtomicString& newName);
     void updateExtraNamedItemRegistration(const AtomicString& oldName, const AtomicString& newName);
 
     void createUniqueElementData();
 
     bool shouldInvalidateDistributionWhenAttributeChanged(ElementShadow*, const QualifiedName&, const AtomicString&);
 
     ElementRareData* elementRareData() const;
@@ skipping 232 matching lines @@
     template <> inline bool isElementOfType<const thisType>(const Element& element) { return element.predicate; } \
     DEFINE_NODE_TYPE_CASTS(thisType, predicate)
 
 #define DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType) \
     template <> inline bool isElementOfType<const thisType>(const Element& element) { return is##thisType(element); } \
     DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION(thisType)
 
 } // namespace
 
 #endif