[w3c/ServiceWorker] Disallow waitUntil() of manually constructed events (#1166)

This change adds a guard to waitUntil() that disallows the extension of
the event that is not dispatched by the user agent.

Fixes #1040.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1166

-- Commit Summary --

  * Disallow waitUntil() of manually constructed events

-- File Changes --

    M docs/index.bs (6)
    M docs/v1/index.bs (6)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1166.patch
https://github.com/w3c/ServiceWorker/pull/1166.diff

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