Rework to not use protected API

sugar/activity/Activity.py

@@ -49,10 +49,11 @@ class ActivityFactory(dbus.service.Object):
 		bus_name = dbus.service.BusName(factory, bus = bus) 
 		dbus.service.Object.__init__(self, bus_name, get_path(factory))
 
-	@dbus.service.method("com.redhat.Sugar.ActivityFactory")
+	@dbus.service.method("com.redhat.Sugar.ActivityFactory",
+						 in_signature="o", out_signature="")
 	def create_with_service(self, service_path):
 		pservice = PresenceService()
-		service = pservice._new_object(service_path)
+		service = pservice.get(service_path)
 		activity = self._class(service, [])
 
 	@dbus.service.method("com.redhat.Sugar.ActivityFactory")

sugar/presence/PresenceService.py

@@ -125,6 +125,9 @@ class PresenceService(gobject.GObject):
 	def _activity_disappeared_cb(self, object_path):
 		gobject.idle_add(self._emit_activity_disappeared_signal, object_path)
 
+	def get(self, object_path):
+		return self._new_object(object_path)
+
 	def get_services(self):
 		resp = self._ps.getServices()
 		servs = []