Re: [ServiceWorker] Specify serviceworker link type for link element and link header. (#828)

Okay, I changed it to move the origin checks to be done before a job is created. Also made the link element processing more in line with how other specs process link elements.

One thing I was wondering is if processing of a Link: header should somehow make sure that the response on which the header is set is the response to a request that originated in a secure context. I think having such a check would make sense, but specifying it is slightly tricky since the whole Link: header processing isn't very precisely defined currently. Ideally there would just be a step somewhere in the fetch spec where Link: headers are processed, at which point the algorithm would have access to the client associated with the request. Maybe currently it's enough to be hand-wavy about where such a client might come from.

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