_mcd_dispatcher_add_request: work in terms of the McdRequest
_mcd_dispatcher_add_request: work in terms of the McdRequest

freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control