Use Mutter fullscreen window tracking for hiding chrome and auto-minimize

Use Mutter fullscreen window tracking for hiding chrome and auto-minimize

Getting fullscreen window tracking right in GNOME Shell turned out to
be very hard, because it depended on details both how Mutter handled
fullscreen windows and the exact timing of that. Fullscreen tracking
and auto-minimization of fullscreen windows that lose their fullscreen
status has thus been implemented in Mutter: use that.

https://bugzilla.gnome.org/show_bug.cgi?id=649748