DevTools: Make getEventListeners() of Console API work for window.

Source/core/events/EventTarget.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, 2008 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 105 matching lines @@
     virtual void uncaughtExceptionInEventHandler();
 
     // Used for legacy "onEvent" attribute APIs.
     bool setAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, DOMWrapperWorld* isolatedWorld = 0);
     EventListener* getAttributeEventListener(const AtomicString& eventType, DOMWrapperWorld* isolatedWorld = 0);
 
     bool hasEventListeners() const;
     bool hasEventListeners(const AtomicString& eventType) const;
     bool hasCapturingEventListeners(const AtomicString& eventType);
     const EventListenerVector& getEventListeners(const AtomicString& eventType);
+    Vector<AtomicString> eventTypes();
 
     bool fireEventListeners(Event*);
     bool isFiringEventListeners();
 
 protected:
     virtual ~EventTarget();
 
     // Subclasses should likely not override these themselves; instead, they should subclass EventTargetWithInlineData.
     virtual EventTargetData* eventTargetData() = 0;
     virtual EventTargetData& ensureEventTargetData() = 0;
@@ skipping 108 matching lines @@
     virtual void refEventTarget() OVERRIDE FINAL { ref(); } \
     virtual void derefEventTarget() OVERRIDE FINAL { deref(); } \
     typedef int thisIsHereToForceASemiColonAfterThisEventTargetMacro
 
 // Use this macro if your EventTarget subclass is also a subclass of WTF::RefCounted.
 // A ref-counted class that uses a different method of refcounting should use DEFINE_EVENT_TARGET_REFCOUNTING directly.
 // Both of these macros are meant to be placed just before the "public:" section of the class declaration.
 #define REFCOUNTED_EVENT_TARGET(className) DEFINE_EVENT_TARGET_REFCOUNTING(RefCounted<className>)
 
 #endif // EventTarget_h