Add support for BeforeUnloadEvent

Source/core/dom/Event.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 94 matching lines @@
     bool bubbles() const { return m_canBubble; }
     bool cancelable() const { return m_cancelable; }
     DOMTimeStamp timeStamp() const { return m_createTime; }
 
     void stopPropagation() { m_propagationStopped = true; }
     void stopImmediatePropagation() { m_immediatePropagationStopped = true; }
 
     // IE Extensions
     EventTarget* srcElement() const { return target(); } // MSIE extension - "the object that fired the event"
 
-    bool returnValue() const { return !defaultPrevented(); }
-    void setReturnValue(bool returnValue) { setDefaultPrevented(!returnValue); }
-
     Clipboard* clipboardData() const { return isClipboardEvent() ? clipboard() : 0; }
 
     virtual const AtomicString& interfaceName() const;
     bool hasInterface(const AtomicString&) const;
 
     // These events are general classes of events.
     virtual bool isUIEvent() const;
     virtual bool isMouseEvent() const;
     virtual bool isFocusEvent() const;
     virtual bool isKeyboardEvent() const;
@@ skipping 22 matching lines @@
 
     bool cancelBubble() const { return m_cancelBubble; }
     void setCancelBubble(bool cancel) { m_cancelBubble = cancel; }
 
     Event* underlyingEvent() const { return m_underlyingEvent.get(); }
     void setUnderlyingEvent(PassRefPtr<Event>);
 
     EventPath& eventPath() { return m_eventPath; }
     PassRefPtr<NodeList> path() const;
 
-    virtual bool storesResultAsString() const;
-    virtual void storeResult(const String&);
-
     virtual Clipboard* clipboard() const { return 0; }
 
     bool isBeingDispatched() const { return eventPhase(); }
 
 protected:
     Event();
     Event(const AtomicString& type, bool canBubble, bool cancelable);
     Event(const AtomicString& type, const EventInit&);
 
     virtual void receivedTarget();
@@ skipping 14 matching lines @@
     EventTarget* m_currentTarget;
     RefPtr<EventTarget> m_target;
     DOMTimeStamp m_createTime;
     RefPtr<Event> m_underlyingEvent;
     EventPath m_eventPath;
 };
 
 } // namespace WebCore
 
 #endif // Event_h