GitLab

Also handles a possible security exception when trying to grant
permissions that chrome probably already has.

Change-Id: I6c6ed7e35885ac4784e1f6b13c3bd9b16aaf9571
Reviewed-on: https://chromium-review.googlesource.com/c/1374390
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615961}