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

Source/core/css/CSSSelector.cpp

 /*
  * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
  *               1999 Waldo Bastian (bastian@kde.org)
  *               2001 Andreas Schlapbach (schlpbch@iam.unibe.ch)
  *               2001-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 871 matching lines @@
     m_a = 0;
     m_b = 0;
     if (argument == "odd") {
         m_a = 2;
         m_b = 1;
     } else if (argument == "even") {
         m_a = 2;
         m_b = 0;
     } else {
         size_t n = argument.find('n');
-        if (n != notFound) {
+        if (n != kNotFound) {
             if (argument[0] == '-') {
                 if (n == 1)
                     m_a = -1; // -n == -1n
                 else
                     m_a = argument.substring(0, n).toInt();
             } else if (!n)
                 m_a = 1; // n == 1n
             else
                 m_a = argument.substring(0, n).toInt();
 
             size_t p = argument.find('+', n);
-            if (p != notFound)
+            if (p != kNotFound)
                 m_b = argument.substring(p + 1, argument.length() - p - 1).toInt();
             else {
                 p = argument.find('-', n);
-                if (p != notFound)
+                if (p != kNotFound)
                     m_b = -argument.substring(p + 1, argument.length() - p - 1).toInt();
             }
         } else
             m_b = argument.toInt();
     }
     return true;
 }
 
 // a helper function for checking nth-arguments
 bool CSSSelector::RareData::matchNth(int count)
 {
     if (!m_a)
         return count == m_b;
     else if (m_a > 0) {
         if (count < m_b)
             return false;
         return (count - m_b) % m_a == 0;
     } else {
         if (count > m_b)
             return false;
         return (m_b - count) % (-m_a) == 0;
     }
 }
 
 } // namespace WebCore