WTF::notFound looks too much like a local variable.

Source/core/dom/NamedNodeMap.cpp

 /*
  * 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) 2004, 2005, 2006, 2007, 2008, 2009, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 44 matching lines @@
     return m_element->getAttributeNode(name);
 }
 
 PassRefPtr<Node> NamedNodeMap::getNamedItemNS(const AtomicString& namespaceURI, const AtomicString& localName) const
 {
     return m_element->getAttributeNodeNS(namespaceURI, localName);
 }
 
 PassRefPtr<Node> NamedNodeMap::removeNamedItem(const AtomicString& name, ExceptionState& es)
 {
-    size_t index = m_element->hasAttributes() ? m_element->getAttributeItemIndex(name, shouldIgnoreAttributeCase(m_element)) : notFound;
-    if (index == notFound) {
+    size_t index = m_element->hasAttributes() ? m_element->getAttributeItemIndex(name, shouldIgnoreAttributeCase(m_element)) : kNotFound;
+    if (index == kNotFound) {
         es.throwDOMException(NotFoundError);
         return 0;
     }
     return m_element->detachAttribute(index);
 }
 
 PassRefPtr<Node> NamedNodeMap::removeNamedItemNS(const AtomicString& namespaceURI, const AtomicString& localName, ExceptionState& es)
 {
-    size_t index = m_element->hasAttributes() ? m_element->getAttributeItemIndex(QualifiedName(nullAtom, localName, namespaceURI)) : notFound;
-    if (index == notFound) {
+    size_t index = m_element->hasAttributes() ? m_element->getAttributeItemIndex(QualifiedName(nullAtom, localName, namespaceURI)) : kNotFound;
+    if (index == kNotFound) {
         es.throwDOMException(NotFoundError);
         return 0;
     }
     return m_element->detachAttribute(index);
 }
 
 PassRefPtr<Node> NamedNodeMap::setNamedItem(Node* node, ExceptionState& es)
 {
     if (!node) {
         es.throwDOMException(NotFoundError);
@@ skipping 22 matching lines @@
 }
 
 size_t NamedNodeMap::length() const
 {
     if (!m_element->hasAttributes())
         return 0;
     return m_element->attributeCount();
 }
 
 } // namespace WebCore