Add support for BeforeUnloadEvent

Source/core/dom/BeforeUnloadEvent.cpp

Index: Source/core/dom/BeforeUnloadEvent.cpp
diff --git a/Source/core/dom/BeforeUnloadEvent.cpp b/Source/core/dom/BeforeUnloadEvent.cpp
index 25f7b0e99c1be90f85edfd7b23aab1c806b84555..a22374c0619eae43160e3d6f50a2538d86996c4f 100644
--- a/Source/core/dom/BeforeUnloadEvent.cpp
+++ b/Source/core/dom/BeforeUnloadEvent.cpp
@@ -1,8 +1,9 @@
-/**
+/*
  * 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
@@ -30,20 +31,16 @@ namespace WebCore {
 BeforeUnloadEvent::BeforeUnloadEvent()
     : Event(eventNames().beforeunloadEvent, false, true)
 {
+    ScriptWrappable::init(this);
 }
 
 BeforeUnloadEvent::~BeforeUnloadEvent()
 {
 }
 
-bool BeforeUnloadEvent::storesResultAsString() const
+bool BeforeUnloadEvent::isBeforeUnloadEvent() const
 {
     return true;
 }
 
-void BeforeUnloadEvent::storeResult(const String& s)
-{
-    m_result = s;
-}
-
 } // namespace WebCore