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[MultiDevice] Updated MultiDevice metrics owners and expirations.

Some metrics were set to expire at M81 that we want to keep. Also
vecore@ is taking ownership of the MultiDevice metrics.

Fixed: 1037153,1037152,1037151
Change-Id: I5e19f3eadfc17a731acc6bc899f8ebef3dec5146
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1981109Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Commit-Queue: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#727508}