[ServiceWorker] Define promise type of ServiceWorkerClient::focus() (#571)

In the spec:

```
interface ServiceWorkerClient {
  ...
  Promise focus();
};
```

That should be `Promise<void> focus()` if it's no value.

---
Reply to this email directly or view it on GitHub:
https://github.com/slightlyoff/ServiceWorker/issues/571

Received on Wednesday, 3 December 2014 02:24:30 UTC