[Managed Session] Enable managed sessions when any risky policies are enabled.

Policies considered risky (besides force-installed extensions and ONC,
it was handled in the previous CLs):
1. Any policies marked with 'website-sharing' tag.
2. 'PacHttpsUrlStripping' policy when it's value is 'false'.

Bug: 910218
Change-Id: Ieade2fc159801597a3ede3b1c115abc285ae716a
Reviewed-on: https://chromium-review.googlesource.com/c/1412478
Commit-Queue: Zakhar Voit <voit@google.com>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625197}
2 files changed