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

Source/core/xml/XPathFunctions.cpp

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 460 matching lines @@
 Value FunSubstringBefore::evaluate() const
 {
     String s1 = arg(0)->evaluate().toString();
     String s2 = arg(1)->evaluate().toString();
 
     if (s2.isEmpty())
         return "";
 
     size_t i = s1.find(s2);
 
-    if (i == notFound)
+    if (i == kNotFound)
         return "";
 
     return s1.left(i);
 }
 
 Value FunSubstringAfter::evaluate() const
 {
     String s1 = arg(0)->evaluate().toString();
     String s2 = arg(1)->evaluate().toString();
 
     size_t i = s1.find(s2);
-    if (i == notFound)
+    if (i == kNotFound)
         return "";
 
     return s1.substring(i + s2.length());
 }
 
 Value FunSubstring::evaluate() const
 {
     String s = arg(0)->evaluate().toString();
     double doublePos = arg(1)->evaluate().toNumber();
     if (std::isnan(doublePos))
@@ skipping 45 matching lines @@
 {
     String s1 = arg(0)->evaluate().toString();
     String s2 = arg(1)->evaluate().toString();
     String s3 = arg(2)->evaluate().toString();
     StringBuilder result;
 
     for (unsigned i1 = 0; i1 < s1.length(); ++i1) {
         UChar ch = s1[i1];
         size_t i2 = s2.find(ch);
 
-        if (i2 == notFound)
+        if (i2 == kNotFound)
             result.append(ch);
         else if (i2 < s3.length())
             result.append(s3[i2]);
     }
 
     return result.toString();
 }
 
 Value FunBoolean::evaluate() const
 {
@@ skipping 30 matching lines @@
     if (!languageAttribute)
         return false;
 
     String langValue = languageAttribute->value();
     while (true) {
         if (equalIgnoringCase(langValue, lang))
             return true;
 
         // Remove suffixes one by one.
         size_t index = langValue.reverseFind('-');
-        if (index == notFound)
+        if (index == kNotFound)
             break;
         langValue = langValue.left(index);
     }
 
     return false;
 }
 
 Value FunFalse::evaluate() const
 {
     return false;
@@ skipping 103 matching lines @@
         return 0;
 
     Function* function = functionRec->factoryFn();
     function->setArguments(args);
     function->setName(name);
     return function;
 }
 
 }
 }