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This changes the subtitle that tells the user who is managing this
device. For Dasher domains, it will continue to be a domain (foo.com).
For FlexOrgs, this will be the email of the administrator of the
organization (admin@foo.com).

BUG=chromium:1081272

Change-Id: I41c6eb66115e2e4b9ad7e4427c12935bbcf4b223
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454155Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Brian Malcolm <bmalcolm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814814}