Re: [whatwg/fetch] From-Origin (#687)

FYI: the PR is pretty close to done. One final thing I'd like us to consider is whether we should add port restrictions to same site, as originally proposed by @jeisigner for a number of features (none for which it's been done thus far, mind).

The idea would be that request and response are only same site if either:

* Both their ports are the https://url.spec.whatwg.org/#default-port (this would allow 80 requesting 443 for ease of HTTPS migration).
* Neither of their ports are the default port.

(I guess this puts a mild dependency on the scheme too.)

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