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

Source/core/dom/EventListenerMap.cpp

Index: Source/core/dom/EventListenerMap.cpp
diff --git a/Source/core/dom/EventListenerMap.cpp b/Source/core/dom/EventListenerMap.cpp
index 35af02fe77c7e3452d75f34fc9b2672120348454..3d34f5925d28475e9364f5df7ddb59cfd31498f2 100644
--- a/Source/core/dom/EventListenerMap.cpp
+++ b/Source/core/dom/EventListenerMap.cpp
@@ -111,7 +111,7 @@ static bool addListenerToVector(EventListenerVector* vector, PassRefPtr<EventLis
 {
     RegisteredEventListener registeredListener(listener, useCapture);
 
-    if (vector->find(registeredListener) != notFound)
+    if (vector->find(registeredListener) != kNotFound)
         return false; // Duplicate listener.
 
     vector->append(registeredListener);
@@ -135,7 +135,7 @@ static bool removeListenerFromVector(EventListenerVector* listenerVector, EventL
 {
     RegisteredEventListener registeredListener(listener, useCapture);
     indexOfRemovedListener = listenerVector->find(registeredListener);
-    if (indexOfRemovedListener == notFound)
+    if (indexOfRemovedListener == kNotFound)
         return false;
     listenerVector->remove(indexOfRemovedListener);
     return true;