Disallow a window focusing itself via javascript URLs or using target _self

Source/core/page/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 842 matching lines @@
         return;
 
     Page* page = m_frame->page();
     if (!page)
         return;
 
     bool allowFocus = WindowFocusAllowedIndicator::windowFocusAllowed();
     if (context) {
         ASSERT(isMainThread());
         Document* activeDocument = toDocument(context);
-        if (opener() && activeDocument->domWindow() == opener())
+        if (opener() && opener() != this && activeDocument->domWindow() == opener())
             allowFocus = true;
     }
 
     // If we're a top level window, bring the window to the front.
     if (m_frame == page->mainFrame() && allowFocus)
         page->chrome()->focus();
 
     if (!m_frame)
         return;
 
@@ skipping 1003 matching lines @@
     WindowFeatures windowFeatures(dialogFeaturesString, screenAvailableRect(m_frame->view()));
     Frame* dialogFrame = createWindow(urlString, emptyAtom, windowFeatures,
         activeWindow, firstFrame, m_frame, function, functionContext);
     if (!dialogFrame)
         return;
     UserGestureIndicatorDisabler disabler;
     dialogFrame->page()->chrome()->runModal();
 }
 
 } // namespace WebCore