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The existing versions of these histograms (without "2") are recorded for
all users, whether they're opted in to the account-scoped store or not,
so they contain a lot of useless entries.
The new version "2" histograms are only recorded for opted-in users.

The old histograms are *not* deprecated yet, in case we want to compare
some numbers from M87 (which only has the old versions) with numbers
from later Chrome versions.

Bug: 1145971
Change-Id: I633769d4b77fbefef17014d613b83a45c3580b3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526064
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825808}