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

Source/core/loader/CrossOriginPreflightResultCache.cpp

 /*
  * Copyright (C) 2008, 2009 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 58 matching lines @@
         --end;
 
     set.add(string.substring(start, end - start + 1));
 }
 
 template<class HashType>
 static bool parseAccessControlAllowList(const String& string, HashSet<String, HashType>& set)
 {
     unsigned start = 0;
     size_t end;
-    while ((end = string.find(',', start)) != notFound) {
+    while ((end = string.find(',', start)) != kNotFound) {
         if (start != end)
             addToAccessControlAllowList(string, start, end - 1, set);
         start = end + 1;
     }
     if (start != string.length())
         addToAccessControlAllowList(string, start, string.length() - 1, set);
 
     return true;
 }
 
@@ skipping 84 matching lines @@
     return false;
 }
 
 void CrossOriginPreflightResultCache::empty()
 {
     ASSERT(isMainThread());
     m_preflightHashMap.clear();
 }
 
 } // namespace WebCore