Re: [ServiceWorker] Support modifying cookies on an intercepted fetch (#837)

@owencm that would work if we had a way to read cookies, but I can't quite get my head around the use-case. If the server knows that cookies need updating, why is there a problem?

Eg:

1. Request made to server with cookie `foo=bar`
1. Server realises that's out of date, and treats it as the correct `foo=world`
1. Sends response along with set-cookie `foo=world`

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