[slightlyoff/ServiceWorker] Eliminate usage of entry and incumbent settings objects (#922)

See https://readable-email.org/list/public-script-coord/topic/multiple-globals-and-you. We'd like to stop using these in new specs. In addition, it seems to be the case that most places that use them, are not actually implemented that way in browsers.

It would be good to do an audit of this spec and see which globals are actually implemented in browsers, then update the spec to use those. In the rare cases where incumbent and entry are actually implemented as specced, it would be ideal to change implementations if possible.

For an example of how you can test implementations, see e.g. https://github.com/whatwg/html/pull/1472 and https://github.com/whatwg/html/pull/1473

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