GitLab

Feedback from users are that they want their collapsed groups to remain
collapsed when reopening their windows.

Also cleaning up kCommandSetTabGroupMetadata which was replaced in M81
for backwards compatibility for color.

Bug: 1127622
Change-Id: Idce8be561c2d060f4c2613bf358502becc70db1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2458876Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816702}