Once this is rolled out, we will no longer need to bootstrap python(3)
in the vpython wrapper, only vpython itself.

Bug: 1318617
Change-Id: If11b81f19d1d15eda74aae94ddc95c2997148c8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3760318Reviewed-by: Chenlin Fan <fancl@chromium.org>
Commit-Queue: Brian Ryner <bryner@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>