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This change will be merged to the M79 branch in keeping with the flag
deprecation rollout strategy:

* M78 expires flags set for 76 & earlier
* M79 expires flags set for 78 & earlier
* M80 expires flags set for 80 & earlier
* MXX expires flags set for XX & earlier onward

Bug: 1019714
Change-Id: Ic789610160f1de11715ed41d6ff153a71487a08d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890814Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711417}