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This fixes an issue where clean up tasks are scheduled but not run until
later when another user has signed in.

Bug: 1048231
Change-Id: I0a453463117d10abcb2c9e9927e9ee3824443892
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036392Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739135}