Oilpan: move DOMWindow object to the oilpan heap.

Source/core/events/WindowEventContext.h

 /*
  * Copyright (C) 2010 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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  */
 
 #ifndef WindowEventContext_h
 #define WindowEventContext_h
 
+#include "heap/Handle.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class DOMWindow;
 class EventTarget;
 class Event;
 class Node;
 class NodeEventContext;
 
 class WindowEventContext {
 public:
     WindowEventContext(Event*, PassRefPtr<Node>, const NodeEventContext*);
 
     DOMWindow* window() const;
     EventTarget* target() const;
     bool handleLocalEvents(Event* event);
 
 private:
-    RefPtr<DOMWindow> m_window;
+    RefPtrWillBePersistent<DOMWindow> m_window;
     RefPtr<EventTarget> m_target;
 };
 
 inline DOMWindow* WindowEventContext::window() const
 {
     return m_window.get();
 }
 
 inline EventTarget* WindowEventContext::target() const
 {
     return m_target.get();
 }
 
 }
 
 #endif // WindowEventContext_h