Remove beforeunload events.

sky/engine/core/events/BeforeUnloadEvent.cpp

Index: sky/engine/core/events/BeforeUnloadEvent.cpp
diff --git a/sky/engine/core/events/BeforeUnloadEvent.cpp b/sky/engine/core/events/BeforeUnloadEvent.cpp
deleted file mode 100644
index 32d19e178e55c78ce20857650d2b948e1464b8c8..0000000000000000000000000000000000000000
--- a/sky/engine/core/events/BeforeUnloadEvent.cpp
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * 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, 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.
- */
-
-#include "config.h"
-#include "core/events/BeforeUnloadEvent.h"
-
-
-namespace blink {
-
-BeforeUnloadEvent::BeforeUnloadEvent()
-    : Event(EventTypeNames::beforeunload, false, true)
-{
-    ScriptWrappable::init(this);
-}
-
-BeforeUnloadEvent::~BeforeUnloadEvent()
-{
-}
-
-bool BeforeUnloadEvent::isBeforeUnloadEvent() const
-{
-    return true;
-}
-
-void BeforeUnloadEvent::trace(Visitor* visitor)
-{
-    Event::trace(visitor);
-}
-
-} // namespace blink