This reverts commit 5166a25b.

Reason for revert: Breaks presubmit tester (again).

Original change's description:
> infra: Switch to "angle_2" presubmit config.
>
> We will revert this once we remove the depot_tools config.
>
> Bug: angleproject:5114
> Change-Id: If922a24c9955ba5d5d30ec634fa6c3d6db177f65
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2831999
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Commit-Queue: Jamie Madill <jmadill@chromium.org>

Bug: angleproject:5114
Change-Id: I7a540c728f6851151c2f708480de21ce41938111
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2836785
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>