Remove more dead code from core/ folder

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 105 matching lines @@
         void reset();
 
         PassRefPtrWillBeRawPtr<MediaQueryList> matchMedia(const String&);
 
         unsigned pendingUnloadEventListeners() const;
 
         static FloatRect adjustWindowRect(LocalFrame&, const FloatRect& pendingChanges);
 
         bool allowPopUp(); // Call on first window, not target window.
         static bool allowPopUp(LocalFrame& firstFrame);
-        static bool canShowModalDialog(const LocalFrame*);
         static bool canShowModalDialogNow(const LocalFrame*);
 
         // DOM Level 0
 
         Screen& screen() const;
         History& history() const;
         BarProp& locationbar() const;
         BarProp& menubar() const;
         BarProp& personalbar() const;
         BarProp& scrollbars() const;
@@ skipping 247 matching lines @@
     }
 
     inline String DOMWindow::defaultStatus() const
     {
         return m_defaultStatus;
     }
 
 } // namespace WebCore
 
 #endif // DOMWindow_h