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It started failing in r482709 since more robust checks were added for
checking for test result output files.

To fix, remove switches::kTestLauncherOutput from the subprocess
command line so it doesn't try to create test result output.

Bug: 776265
Change-Id: Ib0406b77fb7aa90cddf712331342526fa555491b
Reviewed-on: https://chromium-review.googlesource.com/727680
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510254}