Re: [whatwg/fetch] Request.destination for `<link rel=prefetch>` (#658)

It seems reasonable to me that we'd continue using `destination` in cases where we know how the data will be used: `as` provides this information, so when it's present, we should use it.

If we don't have that information, I'd be fine either doing the same thing we do for `preload` without `as` (which I think defaults to `fetch`, and therefore sits under `connect-src`), or defining a new `initiator` and directive to match (`prefetch-src`). I don't have a strong opinion about that, so I'm happy to defer to you folks who own that feature (though, if we do the latter, perhaps it should control `preload` without `as` as well?).

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