Re: [w3c/ServiceWorker] New "setup" lifecycle for service worker (#1576)

That is more concise, but doesn't seem that much better than:

```javascript
var cache;
var init_promise = async function() {
  cache = await readDataFromStorage();
}();

self.addEventListener('fetch', evt =>{
  evt.respondWith(async function() {
    await init_promise;
    // use cache data
  }());
});
```

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