Re: [ServiceWorker] Define environment settings object for service workers (#526)

A service worker's global, i.e. a `ServiceWorkerGlobalScope` object has its associate _service worker_. (https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#dfn-service-worker-global-scope-service-worker) And this _service worker_ internal slot has a reference to its _containing service worker registration_.  (https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#dfn-containing-service-worker-registration)

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