Use resource-level referrer policy for attributionsrc requests
For and <script> the attributionsrc request's referrer policy now
matches the subresource's policy, rather than the document-level
default.
For and window.open, the attribution src request's referrer policy
now matches that of the navigation, rather than the per-request default.
WICG/attribution-reporting-api#382
WICG/attribution-reporting-api#1254
Change-Id: I763c055aef45fc17d41a3ba29b4f6ebfe24646cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5463164
Reviewed-by: Dominic Farolino dom@chromium.org
Reviewed-by: Nan Lin linnan@chromium.org
Commit-Queue: Andrew Paseltiner apaseltiner@chromium.org
Cr-Commit-Position: refs/heads/main@{#1294868}