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

Source/core/css/CSSSelectorList.h

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * 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
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 36 matching lines @@
     const CSSSelector* first() const { return m_selectorArray; }
     static const CSSSelector* next(const CSSSelector*);
     bool hasOneSelector() const { return m_selectorArray && !next(m_selectorArray); }
     const CSSSelector* selectorAt(size_t index) const { return &m_selectorArray[index]; }
 
     size_t indexOfNextSelectorAfter(size_t index) const
     {
         const CSSSelector* current = selectorAt(index);
         current = next(current);
         if (!current)
-            return notFound;
+            return kNotFound;
         return current - m_selectorArray;
     }
 
     bool selectorsNeedNamespaceResolution();
 
     bool hasShadowDistributedAt(size_t index) const;
 
     String selectorsText() const;
 
 private:
@@ skipping 12 matching lines @@
 {
     // Skip subparts of compound selectors.
     while (!current->isLastInTagHistory())
         current++;
     return current->isLastInSelectorList() ? 0 : current + 1;
 }
 
 } // namespace WebCore
 
 #endif // CSSSelectorList_h