Added ApplicationWindowStyle based on Base style.

Change-Id: Ic01c8f4d36f4b9f7d022d74193b5d434db9da541
Reviewed-by: Philippe Coval <rzr@gna.org>
Reviewed-by: Leon Anavi <leon@anavi.org>
Reviewed-by: Tomasz Olszak <olszak.tomasz@gmail.com>