Have Frame::navigationScheduler() return a reference

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 383 matching lines @@
 
     if (protocolIsJavaScript(submission->action())) {
         if (!document().contentSecurityPolicy()->allowFormAction(KURL(submission->action())))
             return;
         document().frame()->script()->executeScriptIfJavaScriptURL(submission->action());
         return;
     }
     submission->setReferrer(document().frame()->loader()->outgoingReferrer());
     submission->setOrigin(document().frame()->loader()->outgoingOrigin());
 
-    document().frame()->navigationScheduler()->scheduleFormSubmission(submission);
+    document().frame()->navigationScheduler().scheduleFormSubmission(submission);
 }
 
 void HTMLFormElement::reset()
 {
     Frame* frame = document().frame();
     if (m_isInResetFunction || !frame)
         return;
 
     m_isInResetFunction = true;
 
@@ skipping 391 matching lines @@
 }
 
 void HTMLFormElement::setDemoted(bool demoted)
 {
     if (demoted)
         UseCounter::count(document(), UseCounter::DemotedFormElement);
     m_wasDemoted = demoted;
 }
 
 } // namespace