Remove more dead code from core/ folder

Source/core/frame/DOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 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 292 matching lines @@
 
     Settings* settings = firstFrame.settings();
     return settings && settings->javaScriptCanOpenWindowsAutomatically();
 }
 
 bool DOMWindow::allowPopUp()
 {
     return m_frame && allowPopUp(*m_frame);
 }
 
-bool DOMWindow::canShowModalDialog(const LocalFrame* frame)
-{
-    if (!frame)
-        return false;
-    FrameHost* host = frame->host();
-    if (!host)
-        return false;
-    return host->chrome().canRunModal();
-}
-
 bool DOMWindow::canShowModalDialogNow(const LocalFrame* frame)
 {
     if (!frame)
         return false;
     FrameHost* host = frame->host();
     if (!host)
         return false;
     return host->chrome().canRunModalNow();
 }
 
@@ skipping 1553 matching lines @@
     visitor->trace(m_media);
     visitor->trace(m_sessionStorage);
     visitor->trace(m_localStorage);
     visitor->trace(m_applicationCache);
     visitor->trace(m_performance);
     visitor->trace(m_css);
     WillBeHeapSupplementable<DOMWindow>::trace(visitor);
 }
 
 } // namespace WebCore