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Update owners to pauljensen@ and mef@ for all active *DNS* histograms.

Change-Id: Ib95d4488d408ab86b4723320c1074af92445150a
Reviewed-on: https://chromium-review.googlesource.com/c/1126173
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603223}