Re: [slightlyoff/ServiceWorker] consider allowing multiple worker thread instances for a single registration (#756)

@ju-lien 

> It's remove the meaning of "this.addEventListener('fetch'", what will be the meaning of "this." ? A random SW scope ? So it could be a good thing to change this syntax to register handler and avoid confusions.

I'm not sure I understand this. `this` will be the global scope of the worker. Due to how the service worker shuts down when it isn't in use, the value of `this` in terms of JS equality may not be the same for two fetches. So if you do `this.foo = 'bar'` in one fetch, it may not be there in another fetch. Parallel workers makes `this` even less consistent between events, but it's already inconsistent.

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