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

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 15272268388eef0241dba42dea94c43567d6ea78..f08ca4e1406949c5ab9a69ba4f1176c60df1eb52 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -798,7 +798,7 @@ PassRefPtr<CDATASection> Document::createCDATASection(const String& data, Except
         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;
     }
@@ -4959,7 +4959,7 @@ 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);
 }