GitLab

This removes part of permission prompts' dependency on
PermissionRequest, with the goal of eventually moving the latter's
functionality into the UI layer.

Bug: 1110905
Change-Id: Icf53d3774c7415453c2266a0db07622483e7b197
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367836
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Olesia Marukhno <olesiamarukhno@google.com>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815091}