Have Frame::navigationScheduler() return a reference

Source/core/html/HTMLFrameOwnerElement.cpp

 /*
  * Copyright (C) 2006, 2007, 2009 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 109 matching lines @@
         return toSVGDocument(doc);
     // Spec: http://www.w3.org/TR/SVG/struct.html#InterfaceGetSVGDocument
     es.throwUninformativeAndGenericDOMException(NotSupportedError);
     return 0;
 }
 
 bool HTMLFrameOwnerElement::loadOrRedirectSubframe(const KURL& url, const AtomicString& frameName, bool lockBackForwardList)
 {
     RefPtr<Frame> parentFrame = document().frame();
     if (contentFrame()) {
-        contentFrame()->navigationScheduler()->scheduleLocationChange(document().securityOrigin(), url.string(), parentFrame->loader()->outgoingReferrer(), lockBackForwardList);
+        contentFrame()->navigationScheduler().scheduleLocationChange(document().securityOrigin(), url.string(), parentFrame->loader()->outgoingReferrer(), lockBackForwardList);
         return true;
     }
 
     if (!document().securityOrigin()->canDisplay(url)) {
         FrameLoader::reportLocalLoadFailed(parentFrame.get(), url.string());
         return false;
     }
 
     if (!SubframeLoadingDisabler::canLoadFrame(this))
         return false;
@@ skipping 28 matching lines @@
     // FIXME: In this case the Frame will have finished loading before
     // it's being added to the child list. It would be a good idea to
     // create the child first, then invoke the loader separately.
     if (childFrame->loader()->state() == FrameStateComplete && !childFrame->loader()->policyDocumentLoader())
         childFrame->loader()->checkCompleted();
     return true;
 }
 
 
 } // namespace WebCore