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

Source/core/platform/mediastream/MediaStreamDescriptor.cpp

 /*
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  * 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.
@@ skipping 37 matching lines @@
 
 PassRefPtr<MediaStreamDescriptor> MediaStreamDescriptor::create(const String& id, const MediaStreamComponentVector& audioComponents, const MediaStreamComponentVector& videoComponents)
 {
     return adoptRef(new MediaStreamDescriptor(id, audioComponents, videoComponents));
 }
 
 void MediaStreamDescriptor::addComponent(PassRefPtr<MediaStreamComponent> component)
 {
     switch (component->source()->type()) {
     case MediaStreamSource::TypeAudio:
-        if (m_audioComponents.find(component) == notFound)
+        if (m_audioComponents.find(component) == kNotFound)
             m_audioComponents.append(component);
         break;
     case MediaStreamSource::TypeVideo:
-        if (m_videoComponents.find(component) == notFound)
+        if (m_videoComponents.find(component) == kNotFound)
             m_videoComponents.append(component);
         break;
     }
 }
 
 void MediaStreamDescriptor::removeComponent(PassRefPtr<MediaStreamComponent> component)
 {
-    size_t pos = notFound;
+    size_t pos = kNotFound;
     switch (component->source()->type()) {
     case MediaStreamSource::TypeAudio:
         pos = m_audioComponents.find(component);
-        if (pos != notFound)
+        if (pos != kNotFound)
             m_audioComponents.remove(pos);
         break;
     case MediaStreamSource::TypeVideo:
         pos = m_videoComponents.find(component);
-        if (pos != notFound)
+        if (pos != kNotFound)
             m_videoComponents.remove(pos);
         break;
     }
 }
 
 void MediaStreamDescriptor::addRemoteTrack(MediaStreamComponent* component)
 {
     if (m_client)
         m_client->addRemoteTrack(component);
     else
@@ skipping 32 matching lines @@
         m_audioComponents.append((*iter));
     }
     for (MediaStreamComponentVector::const_iterator iter = videoComponents.begin(); iter != videoComponents.end(); ++iter) {
         (*iter)->setStream(this);
         m_videoComponents.append((*iter));
     }
 }
 
 } // namespace WebCore