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

I don't think that's sufficient. We want to be able to just serve headers that tell the client that Service Workers are not allowed so that any content with HTTP headers, even if it's not going to run JavaScript, can specify that the origin should not have ServiceWorkers.

I'd also love to have it be a preventative measure as well, and prevent registration of ServiceWorkers, but that may be more ambitious/complicated than I think. For example, if Dropbox knows that it should *never* have a ServiceWorker, they should be able to effectively "turn Service Workers off" for their origin by always specifying said header with all requests.

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