Add support for BeforeUnloadEvent

Source/core/dom/Event.cpp

 /*
  * 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, 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 130 matching lines @@
 bool Event::isDragEvent() const
 {
     return false;
 }
 
 bool Event::isClipboardEvent() const
 {
     return false;
 }
 
-bool Event::storesResultAsString() const
-{
-    return false;
-}
-
 bool Event::isBeforeTextInsertedEvent() const
 {
     return false;
 }
 
-void Event::storeResult(const String&)
+bool Event::isBeforeUnloadEvent() const
 {
+    return false;
 }
 
 void Event::setTarget(PassRefPtr<EventTarget> target)
 {
     if (m_target == target)
         return;
 
     m_target = target;
     if (m_target)
         receivedTarget();
@@ skipping 21 matching lines @@
     for (size_t i = 0; i < eventPathSize; ++i) {
         if (node == m_eventPath[i]->node()) {
             ASSERT(m_eventPath[i]->eventPath());
             return m_eventPath[i]->eventPath();
         }
     }
     return StaticNodeList::createEmpty();
 }
 
 } // namespace WebCore