This reverts commit ba023371.

Reason for revert: decided to use CIPD package instead, see reasoning here: http://shortn/_MgZHcjC60Q.

Original change's description:
> [tools] Add an option to checkout v8-perf repo before running perf tests
>
> R=​machenbach@chromium.org
>
> No-Try: true
> Bug: chromium:838864
> Change-Id: I02e38778ec4c33a20f4b2e93fb22615baa316883
> Reviewed-on: https://chromium-review.googlesource.com/1151295
> Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54723}

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

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

No-Try: true
No-Tree-Checks: true
Bug: chromium:838864
Change-Id: I65a5b075c6fede61b59528ba92f6803011f187c7
Reviewed-on: https://chromium-review.googlesource.com/1153687
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54759}