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This is the UI name of the entity that manages the user's domain, which
can either be a domain name (foo.com), or the admin's email address
(user@foo.com). This function will be used in future cl's.

BUG=chromium:1081272

Change-Id: If0526718a1ae593543711b5a65bff78671123bdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432090
Commit-Queue: Brian Malcolm <bmalcolm@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812454}