i will make patch.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b90be86cccf9bf19ac3bac9b3da1374a32eaa70d

commit b90be86cccf9bf19ac3bac9b3da1374a32eaa70d
Author: Hwanseung Lee <hs1217.lee@samsung.com>
Date: Thu Apr 26 04:32:27 2018

Delete TESTS files in chrome/tools/build/

according to previous git log[1],
it looks likes used to store test files
in official Chrome build gs:// drops.
these files haven't been touched in a long time.
and it seems like not used any more.

[1]https://codereview.chromium.org/545103003

Bug:  829975 
Change-Id: Ida8e887c64d4d18b7eb877f3cda2001a1871b844
Reviewed-on: https://chromium-review.googlesource.com/1027598
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Hwanseung Lee <hwanseung@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553915}
[delete] https://crrev.com/5a40ea2527d1ef1a16859a96449b085d9884903f/chrome/tools/build/chromeos/TESTS
[delete] https://crrev.com/5a40ea2527d1ef1a16859a96449b085d9884903f/chrome/tools/build/linux/TESTS
[delete] https://crrev.com/5a40ea2527d1ef1a16859a96449b085d9884903f/chrome/tools/build/mac/TESTS
[delete] https://crrev.com/5a40ea2527d1ef1a16859a96449b085d9884903f/chrome/tools/build/win/TESTS

after the patch merged, it has been about one month.
it seems doesn't make any trouble.
so i will change this issue's status to "fixed".