[slightlyoff/ServiceWorker] Tidy up global object usage (#950)

This commit is part of the effort in #922 to eliminate the use of entry and incumbent settings objects. It mostly just changes cases where all of relevant/current/entry/incumbent are equivalent, to use relevant. It also removes mention of "default action" for events, since that is not supposed to exist, and does some other tidying in the postMessage algorithms.

There are no normative changes in this commit.
You can view, comment on, or merge this pull request online at:

  https://github.com/slightlyoff/ServiceWorker/pull/950

-- Commit Summary --

  * Tidy up global object usage

-- File Changes --

    M spec/service_worker/index.bs (39)
    M spec/service_worker/index.html (39)

-- Patch Links --

https://github.com/slightlyoff/ServiceWorker/pull/950.patch
https://github.com/slightlyoff/ServiceWorker/pull/950.diff

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