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The User Data dir cannot be cleanly deleted at the end of the main test
function, as there remain files in-use within the directory at that
point. Rather, scope the temp dir to the lifetime of the test harness so
that it can be cleaned up after the test has been spun down.

Bug: 546640
Change-Id: Id942c785bb6c84c40079bc4bde10fad4c7b16d15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1870113
Auto-Submit: Greg Thompson <grt@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707759}