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

Source/core/page/Chrome.cpp

 /*
  * Copyright (C) 2006, 2007, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2012, Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 390 matching lines @@
 
 void Chrome::registerPopupOpeningObserver(PopupOpeningObserver* observer)
 {
     ASSERT(observer);
     m_popupOpeningObservers.append(observer);
 }
 
 void Chrome::unregisterPopupOpeningObserver(PopupOpeningObserver* observer)
 {
     size_t index = m_popupOpeningObservers.find(observer);
-    ASSERT(index != notFound);
+    ASSERT(index != kNotFound);
     m_popupOpeningObservers.remove(index);
 }
 
 void Chrome::notifyPopupOpeningObservers() const
 {
     const Vector<PopupOpeningObserver*> observers(m_popupOpeningObservers);
     for (size_t i = 0; i < observers.size(); ++i)
         observers[i]->willOpenPopup();
 }
 
 } // namespace WebCore