Replace elementHasLegalLinkAttribute() helper with virtual function

Source/web/WebFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 56 matching lines @@
 // triggering its deletion unless something else is still retaining a reference.
 //
 // Thie client is expected to be set whenever the WebFrameImpl is attached to
 // the DOM.
 
 #include "config.h"
 #include "WebFrameImpl.h"
 
 #include <algorithm>
 #include "AssociatedURLLoader.h"
-#include "DOMUtilitiesPrivate.h"
 #include "EventListenerWrapper.h"
 #include "FindInPageCoordinates.h"
 #include "HTMLNames.h"
 #include "PageOverlay.h"
 #include "SharedWorkerRepositoryClientImpl.h"
 #include "WebConsoleMessage.h"
 #include "WebDOMEvent.h"
 #include "WebDOMEventListener.h"
 #include "WebDataSourceImpl.h"
 #include "WebDevToolsAgentPrivate.h"
@@ skipping 2397 matching lines @@
 
         // There is a possibility that the frame being detached was the only
         // pending one. We need to make sure final replies can be sent.
         flushCurrentScopingEffort(m_findRequestIdentifier);
 
         cancelPendingScopingEffort();
     }
 }
 
 } // namespace blink