This reverts commit e1777558.

Reason for revert: Seems to break ANGLE roll for some reason. Reverting while it is investigated.

Bug: chromium:883135

Original change's description:
> DEPS: Remove the need for angle_root.
> 
> BUG=
> 
> Change-Id: I8cd41a3a9c2199bec54b022abc9694835afd1b2f
> Reviewed-on: https://chromium-review.googlesource.com/1219547
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Commit-Queue: Corentin Wallez <cwallez@chromium.org>

TBR=ynovikov@chromium.org,jmadill@chromium.org,cwallez@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I1330b216be34ce9dd9236b8e51a7a6cc578562d7
Reviewed-on: https://chromium-review.googlesource.com/1222366Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>