GitLab

Also removed "Custom options" section as it doesn't need to be advertised anymore.
The only real usecase we still may have is `close_fd_mask`, but it's discouraged and
we better use it on a case-by-case basis, when it's inevitable.

Bug: 539572, 827228
Change-Id: I036303e1da0c844be4c3970ba5351651a2251a89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729847
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683649}