Move wxTopLevelWindow::SetShape() down to wxNonOwnedWindow.

Also add wxNonOwnedWindow for wxMSW (which previously simply typedef'd it to
wxWindow) and document this class now that it provides some user-visible
functionality.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69364 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/nonownedwnd.h

@@ -0,0 +1,26 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msw/nonownedwnd.h
+// Purpose:     wxNonOwnedWindow declaration for wxMSW.
+// Author:      Vadim Zeitlin
+// Created:     2011-10-09
+// RCS-ID:      $Id: wxhead.h,v 1.12 2010-04-22 12:44:51 zeitlin Exp $
+// Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MSW_NONOWNEDWND_H_
+#define _WX_MSW_NONOWNEDWND_H_
+
+// ----------------------------------------------------------------------------
+// wxNonOwnedWindow
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_CORE wxNonOwnedWindow : public wxNonOwnedWindowBase
+{
+public:
+#ifndef __WXWINCE__
+    virtual bool SetShape(const wxRegion& region);
+#endif // !__WXWINCE__
+};
+
+#endif // _WX_MSW_NONOWNEDWND_H_