Re: [ServiceWorker] navigator.serviceWorker is not defined (#689)

The [geolocation spec](http://dev.w3.org/geo/api/spec-source-v2#api_description) goes with:

> 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.

Is that the correct way to do this (along with creating `NavigatorServiceWorker`)?

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https://github.com/slightlyoff/ServiceWorker/issues/689#issuecomment-103097400