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

Source/core/dom/NamedNodeMap.cpp

Index: Source/core/dom/NamedNodeMap.cpp
diff --git a/Source/core/dom/NamedNodeMap.cpp b/Source/core/dom/NamedNodeMap.cpp
index 1e2d0223c7c43f46e8a16bd890d32357290683aa..24e787b7246ff346af2a303ba0954cba438bb4c7 100644
--- a/Source/core/dom/NamedNodeMap.cpp
+++ b/Source/core/dom/NamedNodeMap.cpp
@@ -62,8 +62,8 @@ PassRefPtr<Node> NamedNodeMap::getNamedItemNS(const AtomicString& namespaceURI,
 
 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;
     }
@@ -72,8 +72,8 @@ PassRefPtr<Node> NamedNodeMap::removeNamedItem(const AtomicString& name, Excepti
 
 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;
     }