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The Platform.DailyUseTime metric is used to monitor system health on
numerous dashboards, and as such it should not expire.

BUG=chromium:1089270
TEST=CQ

Change-Id: I28d8593a3cf935d4ba7c1b8f4d76d521f8f0b495
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2541784Reviewed-by: Ian Barkley-Yeung <iby@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Miriam Zimmerman <mutexlox@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827944}