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

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 780 matching lines @@
 {
     return Comment::create(*this, data);
 }
 
 PassRefPtr<CDATASection> Document::createCDATASection(const String& data, ExceptionState& es)
 {
     if (isHTMLDocument()) {
         es.throwDOMException(NotSupportedError);
         return 0;
     }
-    if (data.find("]]>") != WTF::notFound) {
+    if (data.find("]]>") != WTF::kNotFound) {
         es.throwDOMException(InvalidCharacterError, "String cannot contain ']]>' since that is the end delimiter of a CData section.");
         return 0;
     }
     return CDATASection::create(*this, data);
 }
 
 PassRefPtr<ProcessingInstruction> Document::createProcessingInstruction(const String& target, const String& data, ExceptionState& es)
 {
     if (!isValidName(target)) {
         es.throwDOMException(InvalidCharacterError);
@@ skipping 4140 matching lines @@
         m_topLayerElements.append(element);
     }
     element->setIsInTopLayer(true);
 }
 
 void Document::removeFromTopLayer(Element* element)
 {
     if (!element->isInTopLayer())
         return;
     size_t position = m_topLayerElements.find(element);
-    ASSERT(position != notFound);
+    ASSERT(position != kNotFound);
     m_topLayerElements.remove(position);
     element->setIsInTopLayer(false);
 }
 
 HTMLDialogElement* Document::activeModalDialog() const
 {
     if (m_topLayerElements.isEmpty())
         return 0;
     return toHTMLDialogElement(m_topLayerElements.last().get());
 }
@@ skipping 408 matching lines @@
 {
     return DocumentLifecycleNotifier::create(this);
 }
 
 DocumentLifecycleNotifier* Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier*>(ScriptExecutionContext::lifecycleNotifier());
 }
 
 } // namespace WebCore