GitLab

Harden feature policy layout tests and switch them back on.

These tests are still disabled with site isolation until
HasBeenActivated is replicated.

BUG=794631,790549

Change-Id: I8fd2be1f9222c71288d5e39e1639c4d990df995b
Reviewed-on: https://chromium-review.googlesource.com/966069Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545804}