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

Source/modules/mediasource/SourceBufferList.cpp

 /*
  * Copyright (C) 2013 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 40 matching lines @@
 
 void SourceBufferList::add(PassRefPtr<SourceBuffer> buffer)
 {
     m_list.append(buffer);
     scheduleEvent(eventNames().addsourcebufferEvent);
 }
 
 void SourceBufferList::remove(SourceBuffer* buffer)
 {
     size_t index = m_list.find(buffer);
-    if (index == notFound)
+    if (index == kNotFound)
         return;
     m_list.remove(index);
     scheduleEvent(eventNames().removesourcebufferEvent);
 }
 
 void SourceBufferList::clear()
 {
     m_list.clear();
     scheduleEvent(eventNames().removesourcebufferEvent);
 }
@@ skipping 22 matching lines @@
 {
     return &m_eventTargetData;
 }
 
 EventTargetData* SourceBufferList::ensureEventTargetData()
 {
     return &m_eventTargetData;
 }
 
 } // namespace WebCore