Remove beforeunload events.

sky/engine/core/events/BeforeUnloadEvent.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 Apple Computer, Inc.
- * Copyright (C) 2013 Samsung Electronics.
- *
- * 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.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#ifndef BeforeUnloadEvent_h
-#define BeforeUnloadEvent_h
-
-#include "core/events/Event.h"
-
-namespace blink {
-
-class BeforeUnloadEvent FINAL : public Event {
-    DEFINE_WRAPPERTYPEINFO();
-public:
-    virtual ~BeforeUnloadEvent();
-
-    static PassRefPtrWillBeRawPtr<BeforeUnloadEvent> create()
-    {
-        return adoptRefWillBeNoop(new BeforeUnloadEvent);
-    }
-
-    virtual bool isBeforeUnloadEvent() const OVERRIDE;
-
-    void setReturnValue(const String& returnValue) { m_returnValue = returnValue; }
-    String returnValue() const { return m_returnValue; }
-
-    virtual const AtomicString& interfaceName() const OVERRIDE { return EventNames::BeforeUnloadEvent; }
-
-    virtual void trace(Visitor*) OVERRIDE;
-
-private:
-    BeforeUnloadEvent();
-
-    String m_returnValue;
-};
-
-DEFINE_EVENT_TYPE_CASTS(BeforeUnloadEvent);
-
-} // namespace blink
-
-#endif // BeforeUnloadEvent_h