GitLab

Native rule-based has already been launched for 2 milestones. Deleting
the flags code related to it.

The corresponding internal code was deleted in cl/307494837.

Bug: 1034355
Change-Id: I831816b9dd023c14f2e21017af9b2fa69983c88b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367300Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802988}