Make createWindow (mostly) work with OOPIF

Source/core/frame/LocalFrame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 68 matching lines @@
         void createView(const IntSize&, const Color&, bool,
             ScrollbarMode = ScrollbarAuto, bool horizontalLock = false,
             ScrollbarMode = ScrollbarAuto, bool verticalLock = false);
 
         // Frame overrides:
         virtual ~LocalFrame();
         DECLARE_VIRTUAL_TRACE();
         virtual bool isLocalFrame() const override { return true; }
         virtual DOMWindow* domWindow() const override;
         WindowProxy* windowProxy(DOMWrapperWorld&) override;
+        Widget* widget() const override;
         virtual void navigate(Document& originDocument, const KURL&, bool lockBackForwardList) override;
         virtual void reload(ReloadPolicy, ClientRedirectPolicy) override;
         virtual void detach() override;
         virtual void disconnectOwnerElement() override;
         virtual SecurityContext* securityContext() const override;
         void printNavigationErrorMessage(const Frame&, const char* reason) override;
         bool isLoadingAsChild() const override;
 
         void willDetachFrameHost();
 
@@ skipping 205 matching lines @@
     DEFINE_TYPE_CASTS(LocalFrame, Frame, localFrame, localFrame->isLocalFrame(), localFrame.isLocalFrame());
 
 } // namespace blink
 
 // During refactoring, there are some places where we need to do type conversions that
 // will not be needed once all instances of LocalFrame and RemoteFrame are sorted out.
 // At that time this #define will be removed and all the uses of it will need to be corrected.
 #define toLocalFrameTemporary toLocalFrame
 
 #endif // LocalFrame_h