Include PolicyContainerPolicies in FetchClientSettingsObject

This CL changes the FetchClientSettingsObject to include the whole
PolicyContainerPolicies instead of just referrer policy. This requires
some boilerplate in order to convert between public and non-public
types in blink.

For now, this CL is a no-op, but in a follow-up CL we'll use this to
fix Content Security Policy checks for static imports in service
workers.

Bug: 485785246
Change-Id: Ic23708c92e4f4c3bfa4d14d4a21007dc18619c48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7603479
Commit-Queue: Antonio Sartori <antoniosartori@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Ben Reich <benreich@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1594628}
NOKEYCHECK=True
GitOrigin-RevId: f0e69bffcf1af52dc5fa41cb04f82ea16d61a07c