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This CL adds the action handling to the accounts menu added
in https://crrev.com/c/893570.

Bug: 786369
Change-Id: I80a6eb6af477f6a5458dfeb2f2deeb068455760d
Reviewed-on: https://chromium-review.googlesource.com/897325
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534042}