Have DOMWindow deal with references instead of pointers when possible

Source/core/loader/FrameLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ skipping 734 matching lines @@
             page->chrome().focus();
         return;
     }
 
     FrameLoadType newLoadType = determineFrameLoadType(request);
     NavigationAction action(request.resourceRequest(), newLoadType, request.formState(), request.triggeringEvent());
     if (shouldOpenInNewWindow(targetFrame.get(), request, action)) {
         if (action.policy() == NavigationPolicyDownload)
             m_client->loadURLExternally(action.resourceRequest(), NavigationPolicyDownload);
         else
-            createWindowForRequest(request, m_frame, action.policy(), request.shouldSendReferrer());
+            createWindowForRequest(request, *m_frame, action.policy(), request.shouldSendReferrer());
         return;
     }
 
     const KURL& url = request.resourceRequest().url();
     if (!action.shouldOpenInNewWindow() && shouldPerformFragmentNavigation(request.formState(), request.resourceRequest().httpMethod(), newLoadType, url)) {
         m_documentLoader->setTriggeringAction(action);
         loadInSameDocument(url, nullptr, newLoadType == FrameLoadTypeStandard ? UpdateBackForwardList : DoNotUpdateBackForwardList, request.clientRedirect());
         return;
     }
     bool sameURL = url == m_documentLoader->urlForHistory();
@@ skipping 694 matching lines @@
 {
     SandboxFlags flags = m_forcedSandboxFlags;
     if (LocalFrame* parentFrame = m_frame->tree().parent())
         flags |= parentFrame->document()->sandboxFlags();
     if (HTMLFrameOwnerElement* ownerElement = m_frame->ownerElement())
         flags |= ownerElement->sandboxFlags();
     return flags;
 }
 
 } // namespace WebCore