Replace RenderFullScreen with top layer

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 474 matching lines @@
 
     void webkitRequestFullScreen(unsigned short flags);
     bool containsFullScreenElement() const;
     void setContainsFullScreenElement(bool);
     void setContainsFullScreenElementOnAncestorsCrossingFrameBoundaries(bool);
 
     // W3C API
     void webkitRequestFullscreen();
 
     bool isInTopLayer() const;
-    void setIsInTopLayer(bool);
+    virtual void setIsInTopLayer(bool);
 
     void webkitRequestPointerLock();
 
     bool isSpellCheckingEnabled() const;
 
     // FIXME: public for RenderTreeBuilder, we shouldn't expose this though.
     PassRefPtr<RenderStyle> styleForRenderer();
 
     RenderRegion* renderRegion() const;
     const AtomicString& webkitRegionOverset() const;
@@ skipping 378 matching lines @@
 }
 
 inline bool isShadowHost(const Element* element)
 {
     return element && element->shadow();
 }
 
 } // namespace
 
 #endif