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This change adds consistent owners and expiry for all the Crostini
metrics.

Bug: 1037009, 1037010
Change-Id: I97ff20e010eb770969c2c042a23728344c5cb9a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985622Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728094}