Re: [ServiceWorker] Clients & postMessage (#609)

Code like https://github.com/slightlyoff/ServiceWorker/issues/588#issuecomment-66985639 becomes unworkable if we start putting values behind promises.

```js
and let the message events bubble up to `navigator.serviceWorker`
```

>From where? SW instances aside from the one controlling the document are behind promises.

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