This reverts commit 0b971dc2.

Reason for revert: not needed anymore

Original change's description:
> [tools] Add vpython config for run-tests.py
> 
> R=​machenbach@chromium.org
> 
> Bug: v8:7187
> Change-Id: I9c64d637501f074464b1fe3637df50be447603ab
> Reviewed-on: https://chromium-review.googlesource.com/1098934
> Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#53875}

TBR=machenbach@chromium.org,sergiyb@chromium.org

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

Bug: v8:7187
Change-Id: I55d34e65c32e4ae8864ff883870d82803aa11355
Reviewed-on: https://chromium-review.googlesource.com/c/1377049Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58231}