Revert "[FileUtil] Test thread-safety of temp file APIs."

This reverts commit 20a5f39c907e802ca206b60c28334026cd181875.

Reason for revert: Breaking official linux builds.

Original change's description:
> [FileUtil] Test thread-safety of temp file APIs.
> 
> Ruling out https://crbug.com/826408#c17 as the source of the issue.
> 
> R=‚Äčthestig@chromium.org
> 
> Bug: 826408
> Change-Id: I00396084d674fa2f700eb917300280b6eed1684d
> Reviewed-on: https://chromium-review.googlesource.com/1072030
> Commit-Queue: Gabriel Charette <gab@chromium.org>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#561666}

TBR=gab@chromium.org,thestig@chromium.org

Change-Id: Icc838da2c247563b94c5e6508c8c268df68f3ce9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 826408, 846563
Reviewed-on: https://chromium-review.googlesource.com/1072966
Reviewed-by: Michael Moss <mmoss@chromium.org>
Commit-Queue: Michael Moss <mmoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561772}
1 file changed