This is a revert of a small chunk of
https://chromium-review.googlesource.com/c/angle/angle/+/1761163 that is
suspect to cause weird failures on the GPU FYI waterfall in Debug on
Windows, maybe because the many disk writes are too slow.

BUG=chromium:997667
TBR=jmadill@chromium.org

Change-Id: Ifb799d2ed90682e55e5cc7c0ce21d2598bf30c9e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1768371Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>