Rename FeatureObserver to UseCounter to make clear that all it stores are usage counts.

Source/WebCore/dom/EventTarget.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 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 193 matching lines @@
     else if (listenerPrefixedVector)
         fireEventListeners(createMatchingPrefixedEvent(event).get(), d, *listenerPrefixedVector);
 
     if (!prefixedTypeName.isEmpty()) {
         ScriptExecutionContext* context = scriptExecutionContext();
         if (context && context->isDocument()) {
             Document* document = toDocument(context);
             if (document->domWindow()) {
                 if (listenerPrefixedVector)
                     if (listenerUnprefixedVector)
-                        FeatureObserver::observe(document->domWindow(), FeatureObserver::PrefixedAndUnprefixedTransitionEndEvent);
+                        UseCounter::observe(document->domWindow(), UseCounter::PrefixedAndUnprefixedTransitionEndEvent);
                     else
-                        FeatureObserver::observe(document->domWindow(), FeatureObserver::PrefixedTransitionEndEvent);
+                        UseCounter::observe(document->domWindow(), UseCounter::PrefixedTransitionEndEvent);
                 else if (listenerUnprefixedVector)
-                    FeatureObserver::observe(document->domWindow(), FeatureObserver::UnprefixedTransitionEndEvent);
+                    UseCounter::observe(document->domWindow(), UseCounter::UnprefixedTransitionEndEvent);
             }
         }
     }
 
     return !event->defaultPrevented();
 }
         
 void EventTarget::fireEventListeners(Event* event, EventTargetData* d, EventListenerVector& entry)
 {
     RefPtr<EventTarget> protect = this;
@@ skipping 66 matching lines @@
     // they have one less listener to invoke.
     if (d->firingEventIterators) {
         for (size_t i = 0; i < d->firingEventIterators->size(); ++i) {
             d->firingEventIterators->at(i).iterator = 0;
             d->firingEventIterators->at(i).end = 0;
         }
     }
 }
 
 } // namespace WebCore