* Fixes a memory leak if multiple window is not supported.
* Common code removed by calling one constructor from another.
* Fixes a circular dependency with Adaptor.
The Adaptor needs a Window and Window needs the Adaptor to
be created.
Change-Id: Icf4443f1ecfc758d1fd68d6d8ee032dd3e96274e Signed-off-by: Victor Cebollada <v.cebollada@samsung.com>