Remove dead code from LiveNodeListBase

Source/core/dom/LiveNodeList.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2007 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 42 matching lines @@
         : m_ownerNode(ownerNode)
         , m_cachedItem(0)
         , m_isLengthCacheValid(false)
         , m_isItemCacheValid(false)
         , m_rootType(rootType)
         , m_invalidationType(invalidationType)
         , m_shouldOnlyIncludeDirectChildren(shouldOnlyIncludeDirectChildren)
         , m_isNameCacheValid(false)
         , m_collectionType(collectionType)
         , m_overridesItemAfter(itemAfterOverrideType == OverridesItemAfter)
-        , m_isItemRefElementsCacheValid(false)
     {
         ASSERT(m_rootType == static_cast<unsigned>(rootType));
         ASSERT(m_invalidationType == static_cast<unsigned>(invalidationType));
         ASSERT(m_collectionType == static_cast<unsigned>(collectionType));
         ASSERT(!m_overridesItemAfter || !isNodeList(collectionType));
 
         if (collectionType != ChildNodeListType)
             document().registerNodeList(this);
     }
 
@@ skipping 43 matching lines @@
     }
     ALWAYS_INLINE void setItemCache(Node* item, unsigned offset) const
     {
         ASSERT(item);
         m_cachedItem = item;
         m_cachedItemOffset = offset;
         m_isItemCacheValid = true;
     }
     void setItemCache(Node* item, unsigned offset, unsigned elementsArrayOffset) const;
 
-    ALWAYS_INLINE bool isItemRefElementsCacheValid() const { return m_isItemRefElementsCacheValid; }
-    ALWAYS_INLINE void setItemRefElementsCacheValid() const { m_isItemRefElementsCacheValid = true; }
-
     ALWAYS_INLINE NodeListRootType rootType() const { return static_cast<NodeListRootType>(m_rootType); }
 
     bool hasNameCache() const { return m_isNameCacheValid; }
     void setHasNameCache() const { m_isNameCacheValid = true; }
 
     bool shouldOnlyIncludeDirectChildren() const { return m_shouldOnlyIncludeDirectChildren; }
 
 private:
     Node* itemBeforeOrAfterCachedItem(unsigned offset, ContainerNode* root) const;
     Node* traverseChildNodeListForwardToOffset(unsigned offset, Node* currentNode, unsigned& currentOffset) const;
@@ skipping 11 matching lines @@
     mutable unsigned m_isLengthCacheValid : 1;
     mutable unsigned m_isItemCacheValid : 1;
     const unsigned m_rootType : 2;
     const unsigned m_invalidationType : 4;
     const unsigned m_shouldOnlyIncludeDirectChildren : 1;
 
     // From HTMLCollection
     mutable unsigned m_isNameCacheValid : 1;
     const unsigned m_collectionType : 5;
     const unsigned m_overridesItemAfter : 1;
-    mutable unsigned m_isItemRefElementsCacheValid : 1;
 };
 
 ALWAYS_INLINE bool LiveNodeListBase::shouldInvalidateTypeOnAttributeChange(NodeListInvalidationType type, const QualifiedName& attrName)
 {
     switch (type) {
     case InvalidateOnClassAttrChange:
         return attrName == HTMLNames::classAttr;
     case InvalidateOnNameAttrChange:
         return attrName == HTMLNames::nameAttr;
     case InvalidateOnIdNameAttrChange:
@@ skipping 24 matching lines @@
     virtual Node* namedItem(const AtomicString&) const OVERRIDE;
     virtual bool nodeMatches(Element*) const = 0;
 
 private:
     virtual bool isLiveNodeList() const OVERRIDE { return true; }
 };
 
 } // namespace WebCore
 
 #endif // LiveNodeList_h