protocol-chooser: use TpConnectionManagerProtocol accessors
protocol-chooser: use TpConnectionManagerProtocol accessors

https://bugzilla.gnome.org/show_bug.cgi?id=677545

GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets