Properly retain non-node event listeners.

Source/WebCore/bindings/dart/DartDOMData.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 27 matching lines @@
 #include <wtf/HashSet.h>
 #include <wtf/RefPtr.h>
 
 namespace WebCore {
 
 class ActiveDOMObject;
 class DOMWindow;
 class DartApplicationLoader;
 class DartEventListener;
 class DartWeakCallback;
+class EventTarget;
 class MessagePort;
 class Node;
 class ScriptExecutionContext;
 
 typedef HashMap<Node*, Dart_Handle> DartDOMNodeMap;
 typedef HashMap<void*, Dart_Handle> DartDOMObjectMap;
 typedef HashMap<MessagePort*, Dart_Handle> DartMessagePortMap;
 typedef HashMap<ActiveDOMObject*, Dart_Handle> DartActiveDOMObjectMap;
+typedef HashMap<EventTarget*, Dart_Handle> DartEventTargetMap;
 typedef HashSet<DartWeakCallback*> DartWeakCallbacks;
 
 class DartDOMData {
 public:
     DartDOMData(PassRefPtr<DartApplicationLoader>, ScriptExecutionContext*);
     ~DartDOMData();
 
     PassRefPtr<DartApplicationLoader> applicationLoader();
     ScriptExecutionContext* scriptExecutionContext() { return m_scriptExecutionContext; }
 
     int* recursion() { return &m_recursion; }
     DartStringCache& stringCache() { return m_stringCache; }
 
     DartDOMNodeMap* nodeMap() { return &m_nodeMap; }
     DartDOMObjectMap* objectMap() { return &m_objectMap; }
     DartMessagePortMap* messagePortMap() { return &m_messagePortMap; }
     DartActiveDOMObjectMap* activeObjectMap() { return &m_activeObjectMap; }
+    DartEventTargetMap* eventTargetMap() { return &m_eventTargetMap; }
     DartWeakCallbacks* weakCallbacks() { return &m_weakCallbacks; }
 
 private:
     RefPtr<DartApplicationLoader> m_applicationLoader;
     ScriptExecutionContext* m_scriptExecutionContext;
     int m_recursion;
     DartStringCache m_stringCache;
 
     DartDOMNodeMap m_nodeMap;
     DartDOMObjectMap m_objectMap;
     DartMessagePortMap m_messagePortMap;
     DartActiveDOMObjectMap m_activeObjectMap;
+    DartEventTargetMap m_eventTargetMap;
     DartWeakCallbacks m_weakCallbacks;
 };
 
 }
 
 #endif // DartDOMData_h