This forces all child processes to quit when the parent process is
unexpectedly terminated.

Disabled on Windows 7 because it seems to fail with assinging the
process to the job object. Possibly because of permission conflicts
with the Chromium base/test launcher.

Bug: angleproject:3162
Change-Id: I35f1c1ac5c802904b9b7220cab1bafce1ae0ea15
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1862989Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>