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GAIA ID is now provided as part of PolicyData for user policies.
It could be exposed together with user email if it's OK from privacy
perspective.
It will be useful because username field doesn't change on user rename
and GAIA ID is now used for PolicyData user identification.

BUG=831655
TEST=Open chrome://policy

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ia4cfea54c80a2a5cfa7f9e8803f7ca50f9596c70
Reviewed-on: https://chromium-review.googlesource.com/1016903Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Drew Wilson <atwilson@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551706}