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With Offline Page being fully deployed there is no need anymore for the
UI-exclusive flag that was introduced in its very beginnings, as a means
to have its pipeline tested without any visual clues of its existence.

This change removes that flag that and consolidates all UI related
checks on the main feature flag that still remains in place.

Bug: 850588
Change-Id: If30bbf36b8361a5af69bf59a748600d5fd1e71ea
Reviewed-on: https://chromium-review.googlesource.com/1157526Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Commit-Queue: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580019}