Update watchlists for asvitkine.
Update watchlists for asvitkine.

Add one for about_flags, since I'm interested in getting
people to switch to FeatureList API and update the paths
for metrics code.

BUG=none

Review URL: https://codereview.chromium.org/1418693007

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#358143}

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