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

Source/core/dom/NodeRenderingContext.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Google Inc. 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
@@ skipping 54 matching lines @@
         // ordered in DOM tree order. We don't have a good way to do that yet,
         // since NodeRenderingTraversal isn't aware of reparenting. It's safe to
         // just append for now; it doesn't disrupt the top layer rendering as
         // the layer collection in RenderLayer only requires that top layer
         // renderers are orderered correctly relative to each other.
         if (!element->isInTopLayer())
             return 0;
 
         const Vector<RefPtr<Element> >& topLayerElements = element->document().topLayerElements();
         size_t position = topLayerElements.find(element);
-        ASSERT(position != notFound);
+        ASSERT(position != kNotFound);
         for (size_t i = position + 1; i < topLayerElements.size(); ++i) {
             if (RenderObject* renderer = topLayerElements[i]->renderer())
                 return renderer;
         }
         return 0;
     }
 
     if (m_parentFlowRenderer)
         return m_parentFlowRenderer->nextRendererForNode(m_node);
 
@@ skipping 191 matching lines @@
     newRenderer->setFlowThreadState(parentRenderer->flowThreadState());
 
     RenderObject* nextRenderer = this->nextRenderer();
     textNode->setRenderer(newRenderer);
     // Parent takes care of the animations, no need to call setAnimatableStyle.
     newRenderer->setStyle(m_style.release());
     parentRenderer->addChild(newRenderer, nextRenderer);
 }
 
 }