Re: [ServiceWorker] Add cookie accessor/setter methods? (#707)

@jakearchibald For educational purposes, why throw when both are set? AFAIK, it's not uncommon for devs to set  both, or receive cookies that have only `expires` set  instead of `maxAge` because of the older browsers their application or services support. 

 Nonetheless, the older browsers that accept only `expires` like IE 6, 7, & 8 are EOL'd (the latter January 12, 2016)…

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