ServiceWorker

c2b59bfd - Disallow waitUntil() of manually constructed events (#1166)

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. Issue: https://github.com/w3c/ServiceWorker/issues/#1040. Test: https://github.com/w3c/web-platform-tests/pull/6517.