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Right now the file used to pass command line parameters to test-
processes is not removed after the test finished. In cases where tests
are run in repeat mode those flag files just keep accumulating until
the system runs out of space in it's $TMPDIR.

To solve this, the patch makes sure the path to the file containing the
flags is stored in UnitTestProcessLifetimeObserver and removed once
the OnCompleted method is called.

Bug: 814687
Change-Id: Ifb0ba6dba860d9297fbc2c939e0cc10f620907fa
Reviewed-on: https://chromium-review.googlesource.com/931341
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539104}