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

Source/web/PageOverlayList.h

 /*
  * 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.
  *
@@ skipping 48 matching lines @@
     void update();
     void paintWebFrame(WebCore::GraphicsContext&);
 
     size_t findGraphicsLayer(WebCore::GraphicsLayer*);
 
 private:
     typedef Vector<OwnPtr<PageOverlay>, 2> PageOverlays;
 
     explicit PageOverlayList(WebViewImpl*);
 
-    // Returns the index of the client found. Otherwise, returns WTF::notFound.
+    // Returns the index of the client found. Otherwise, returns WTF::kNotFound.
     size_t find(WebPageOverlay*);
 
     WebViewImpl* m_viewImpl;
     PageOverlays m_pageOverlays;
 };
 
 } // namespace WebKit
 
 #endif // PageOverlayList_h