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As a followup to [1], this CL ensures that on-by-default Client Hints
don't get removed from cross-origin redirects.
It similarly makes sure that legacy hints that don't abide to
FeaturePolicy get a free pass on the removal in that case.
Finally, it makes sure that UA-Mobile's FeaturePolicy's default value
is "all".

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2178572

Bug: 911952, 1082072
Change-Id: I1f329a3c24397a287a1cbc333cd0976bb16d640a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199107
Commit-Queue: Yoav Weiss <yoavweiss@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Aaron Tagliaboschi <aarontag@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768549}