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

Source/core/platform/network/MIMEHeader.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 48 matching lines @@
         }
         // New key/value, store the previous one if any.
         if (!key.isEmpty()) {
             if (keyValuePairs.find(key) != keyValuePairs.end())
                 LOG_ERROR("Key duplicate found in MIME header. Key is '%s', previous value replaced.", key.ascii().data());
             keyValuePairs.add(key, value.toString().stripWhiteSpace());
             key = String();
             value.clear();
         }
         size_t semiColonIndex = line.find(':');
-        if (semiColonIndex == notFound) {
+        if (semiColonIndex == kNotFound) {
             // This is not a key value pair, ignore.
             continue;
         }
         key = line.substring(0, semiColonIndex).lower().stripWhiteSpace();
         value.append(line.substring(semiColonIndex + 1));
     }
     // Store the last property if there is one.
     if (!key.isEmpty())
         keyValuePairs.set(key, value.toString().stripWhiteSpace());
     return keyValuePairs;
@@ skipping 49 matching lines @@
     LOG_ERROR("Unknown encoding '%s' found in MIME header.", text.ascii().data());
     return Unknown;
 }
 
 MIMEHeader::MIMEHeader()
     : m_contentTransferEncoding(Unknown)
 {
 }
 
 }