[w3c/ServiceWorker] Use ExtendableMessageEvent for messageerror in service workers. (#1485)

It seems inconsistent to use ExtendableMessageEvent for message events but not for messageerror events. This fixes that inconsistency.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1485

-- Commit Summary --

  * Use ExtendableMessageEvent for messageerror in service workers.

-- File Changes --

    M docs/index.bs (9)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1485.patch
https://github.com/w3c/ServiceWorker/pull/1485.diff

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https://github.com/w3c/ServiceWorker/pull/1485