Re: [ServiceWorker] Make secure context requirements more explicit (#754)

I'd like to understand what @mikewest thinks.

The plain reading of the Secure Contexts doc is that an `https` (secure) document w/ potentially matching SW but which is loaded as an iframe that's a child of an `http` (insecure) can't use SWs. I'm not sure how much value there is in not adopting this stronger definition, but I'd like to hear from more people about it.

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