ACTION-41: Respond to Dom's mail about geolocation tests.

Dom was using the global name space, instead of navigator, to access geolocation. I responded with the normative text in the spec:


Objects implementing the Navigator interface (e.g. the window.navigator object) must also implement the NavigatorGeolocation interface [NAVIGATOR]. An instance of NavigatorGeolocation would be then obtained by using binding-specific casting methods on an instance of Navigator.