Kara Erickson ff1be4cd28 ci: tighten code owners for size tracking (#33969)
It will be easier to track regressions in size if fewer people
are approving size diffs in PRs. That way, we will have a few
people that have a fuller picture of where size changes are
coming from.

PR Close #33969
2019-11-22 16:51:41 -05:00
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