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

Source/core/platform/Length.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller ( mueller@kde.org )
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  *
  * 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
@@ skipping 81 matching lines @@
     if (!str->length())
         return Vector<Length>();
 
     unsigned len = str->count(' ') + 1;
     Vector<Length> r(len);
 
     int i = 0;
     unsigned pos = 0;
     size_t pos2;
 
-    while ((pos2 = str->find(' ', pos)) != notFound) {
+    while ((pos2 = str->find(' ', pos)) != kNotFound) {
         r[i++] = parseHTMLAreaCoordinate(str->characters8() + pos, pos2 - pos);
         pos = pos2 + 1;
     }
     r[i] = parseHTMLAreaCoordinate(str->characters8() + pos, str->length() - pos);
 
     ASSERT(i == len - 1);
 
     return r;
 }
 
@@ skipping 97 matching lines @@
     return isCalculated() && (calculationValue() == o.calculationValue() || *calculationValue() == *o.calculationValue());
 }
 
 struct SameSizeAsLength {
     int32_t value;
     int32_t metaData;
 };
 COMPILE_ASSERT(sizeof(Length) == sizeof(SameSizeAsLength), length_should_stay_small);
 
 } // namespace WebCore