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

Source/core/html/track/TextTrackCueList.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:
  * 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 91 matching lines @@
     size_t index = (start + end) / 2;
     if (cue->startTime() < m_list[index]->startTime() || (cue->startTime() == m_list[index]->startTime() && cue->endTime() > m_list[index]->endTime()))
         return add(cue.release(), start, index);
 
     return add(cue.release(), index + 1, end);
 }
 
 bool TextTrackCueList::remove(TextTrackCue* cue)
 {
     size_t index = m_list.find(cue);
-    if (index == notFound)
+    if (index == kNotFound)
         return false;
 
     cue->setIsActive(false);
     m_list.remove(index);
     return true;
 }
 
 bool TextTrackCueList::contains(TextTrackCue* cue) const
 {
     return m_list.contains(cue);
@@ skipping 14 matching lines @@
 }
 
 void TextTrackCueList::invalidateCueIndexes(size_t start)
 {
     for (size_t i = start; i < m_list.size(); ++i)
         m_list[i]->invalidateCueIndex();
 }
 
 } // namespace WebCore