We're no longer need it, so it would better to just remove it. We still
use the agl-shell for setting the wayland surfaces, but we don't use the
Shell object wrapper for that.
Bug-AGL: SPEC-4912 Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: I3776cd25e312f6ed128bbe14b187607f4b607541