Re: [w3c/ServiceWorker] Remove foreign fetch (#1188)

Seems like this would have been a great way to give web apps the ability to fetch content from mirrored sources if the primary source is down or blocked. 

The service worker should be able to work its way down a list of mirror domains, perhaps falling back to something like an IPFS request when all mirrors fail. Perhaps there should be an exception, allowing this to be done for assets which provide a content hash or are otherwise uniquely named, so as to not require further keying. If it's a security concern, then require the asset name to match the content hash and enforce a check before updating the cache, IPFS-style.

This would enable dramatically more robust apps which might take advantage of P2P networks to fetch resources locally when available.  

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