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Add histograms to count the number enabled and disabled extensions that
are not present in the Enhanced Safe Browsing CRX allowlist per profile.
The metrics are separated for all users versus Enhanced Safe Browsing
users.

Bug: 1153873
Change-Id: I84f167042fe63299b8da0669c9d117bf136090e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627827
Commit-Queue: Jeff Cyr <jeffcyr@google.com>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843932}