Oilpan: move History to the oilpan heap.

Source/core/frame/DOMWindow.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 326 matching lines @@
         void resetDOMWindowProperties();
         void willDestroyDocumentInFrame();
 
         RefPtr<Document> m_document;
 
         bool m_shouldPrintWhenFinishedLoading;
 
         HashSet<DOMWindowProperty*> m_properties;
 
         mutable RefPtrWillBePersistent<Screen> m_screen;
-        mutable RefPtr<History> m_history;
+        mutable RefPtrWillBePersistent<History> m_history;
         mutable RefPtr<BarProp> m_locationbar;
         mutable RefPtr<BarProp> m_menubar;
         mutable RefPtr<BarProp> m_personalbar;
         mutable RefPtr<BarProp> m_scrollbars;
         mutable RefPtr<BarProp> m_statusbar;
         mutable RefPtr<BarProp> m_toolbar;
         mutable RefPtr<Console> m_console;
         mutable RefPtrWillBePersistent<Navigator> m_navigator;
         mutable RefPtr<Location> m_location;
         mutable RefPtr<StyleMedia> m_media;
@@ skipping 19 matching lines @@
     }
 
     inline String DOMWindow::defaultStatus() const
     {
         return m_defaultStatus;
     }
 
 } // namespace WebCore
 
 #endif // DOMWindow_h