This reverts commit 11c31e0a.
Reason for revert: Broke ANGLE -> Skia roll because of GN error.
Bug: angleproject:5489
Original change's description:
> Changes to build inside a Dawn checkout.
>
> Add an "angle_standalone" flag that can be disabled by Dawn.
> Put test definitions behind angle_standalone || build_with_chromium.
>
> Bug: angleproject:5462
> Change-Id: I58c9b18723384334156e2a3dd86ed3f89afcaade
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2587451
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Commit-Queue: Stephen White <senorblanco@chromium.org>
TBR=senorblanco@chromium.org,jmadill@chromium.org
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: angleproject:5462
Change-Id: I4363d1d35b03e00d970e25ddd3d7eac51ad2da2d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2600078Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
