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The legacy SBER pref has been completely replaced by the Scout pref.
This change removes the legacy SBER string and removes the checkbox from
the unified and un-unified UIs.

Bug: 662944
Change-Id: Icae674d21de1782dfaef5cc125a9bc79cbf4fa1a
Reviewed-on: https://chromium-review.googlesource.com/c/1312624Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604642}