Re: [whatwg/fetch] Add referrer policy to blob-generated responses (#306)

This is the responsibility of https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer. By my reading it will reach step 3.3.3 (_referrerSource_ = "about:blank"), but then step 4 will set _referrerURL_ to `no referrer` (since about: is a local scheme), which is what will be returned in step 6 (where the policy is "").

I can't actually find where Fetch invokes https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer; @annevk? The section https://w3c.github.io/webappsec-referrer-policy/#integration-with-fetch seems inaccurate.

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