Have DOMWindow deal with references instead of pointers when possible

Source/core/html/HTMLFormElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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 405 matching lines @@
 
     if (protocolIsJavaScript(submission->action())) {
         if (!document().contentSecurityPolicy()->allowFormAction(KURL(submission->action())))
             return;
         document().frame()->script().executeScriptIfJavaScriptURL(submission->action());
         return;
     }
 
     LocalFrame* targetFrame = document().frame()->loader().findFrameForNavigation(submission->target(), submission->state()->sourceDocument());
     if (!targetFrame) {
-        if (!DOMWindow::allowPopUp(document().frame()) && !UserGestureIndicator::processingUserGesture())
+        if (!DOMWindow::allowPopUp(*document().frame()) && !UserGestureIndicator::processingUserGesture())
             return;
         targetFrame = document().frame();
     } else {
         submission->clearTarget();
     }
     if (!targetFrame->page())
         return;
 
     submission->setReferrer(Referrer(document().outgoingReferrer(), document().referrerPolicy()));
     submission->setOrigin(document().outgoingOrigin());
@@ skipping 379 matching lines @@
 }
 
 void HTMLFormElement::setDemoted(bool demoted)
 {
     if (demoted)
         UseCounter::count(document(), UseCounter::DemotedFormElement);
     m_wasDemoted = demoted;
 }
 
 } // namespace