GitLab

This CL adds an additional check to make sure that the messages setup
button is disabled when the feature is prohibited by policy. This fixes
crashes when a user tries to click the button in this state.

Bug: 953398
Change-Id: Ia27e16ca34ac07e952a9c873d9c3d1f16fac8c39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1573090
Commit-Queue: Azeem Arshad <azeemarshad@chromium.org>
Reviewed-by: Jeremy Klein <jlklein@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652268}