Re: [ServiceWorker] A header/something to kill SWs (#614)

FYI I think the current APIs let you implement the equivalent of an ```unregister({immediate:true})``` worker:

```javascript
skipWaiting();
onactivate = function(e) {
  e.waitUntil(clients.claim()
    .then(function() { return self.registration.unregister(); }
    .then(function() { return Promise.reject(); })));
};
```

A more sugary syntax may still be good.

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