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During service teardown, tasks are posted to the TestMockTimeTaskRunner
to close open files. These must be run during TearDown so that files can
be closed, thereby allowing the ScopedTempDir to clean itself.

Bug: 546640
Change-Id: Ibdfa0cc63f79f27237040765777fed344f7ad7b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895337
Auto-Submit: Greg Thompson <grt@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711836}