GitLab

Update the plan to remove it at m84. This is because there is
an agreement that 4 milestones notice will be provided prior
to removing the policy.

https://www.chromium.org/Home/third-party-developers

Bug: 1036230
Change-Id: I7e8a710a116df37ea6099a2036f7f471b4394f86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022363
Auto-Submit: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735763}