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Presence of Chrome OS Account Manager implies Mirror Account
Reconciliation, which implies that the only allowed operations are:

  - Going Incognito.
  - Displaying Chrome OS Account Manager.

The incognito case is already handled.
Handle the display of Chrome OS Account Manager.

Bug: 833797
Change-Id: I387db8a50a84f82724fa8f4b41b32f3a8fccf518
Reviewed-on: https://chromium-review.googlesource.com/1188474Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585834}