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1) If we're navigating a top-level, feature policy isn't generally
   available; this broke its application for client hints in fresh tabs.
   Instead, just use 1P check since we don't have feature-policy yet.
2) The 1P/3P check is also needed if we don't have feature policy use
   enabled.
3) The bug in #2 was unnoticed because the virtual testsuite for feature
   policy integration off only disabled it on renderer and not browser.

Bug: 1050726

Change-Id: I9a26e8f818656e96ba130da38d08ccd017867f9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087977
Commit-Queue: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747752}