Allow browsers to block mixed content requests from cross-origin tests. #17300
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Gecko and Blink by default block mixed content requests.
As a result, header-referrer-strict-origin-when-cross-origin.https.html, header-referrer-strict-origin.https.html,
and beacon/headers/header-referrer-unsafe-url.https.html fail in those two browser engines.
Allow the mixed content beacon requests to be blocked in these tests as allowed by the specification:
https://www.w3.org/TR/mixed-content/#should-block-fetch
https://www.w3.org/TR/mixed-content/#requirements-user-controls
Also fixed a bug in header-referrer-strict-origin-when-cross-origin.https.html that it was not testing cross-origin.