Merge the Sky Engine changes from the SkyDart branch

sky/engine/core/events/EventListenerMap.h

 /*
  * 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, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2011 Andreas Kling (kling@webkit.org)
  *
  * Redistribution and use in source and binary forms, with or without
@@ skipping 55 matching lines @@
 
 #if ENABLE(ASSERT)
     int m_activeIteratorCount;
 #endif
 };
 
 class EventListenerIterator {
     WTF_MAKE_NONCOPYABLE(EventListenerIterator);
 public:
     EventListenerIterator();
-    EventListenerIterator(EventTarget*);
+    EventListenerIterator(const EventTarget*);
 #if ENABLE(ASSERT)
     ~EventListenerIterator();
 #endif
 
     EventListener* nextListener();
 
 private:
     EventListenerMap* m_map;
     unsigned m_entryIndex;
     unsigned m_index;
 };
 
 #if !ENABLE(ASSERT)
 inline void EventListenerMap::assertNoActiveIterators() { }
 #endif
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_EVENTS_EVENTLISTENERMAP_H_