This is a reland of 028367fe
Should be good to go
https://bugs.chromium.org/p/chromium/issues/detail?id=993053#c36

Original change's description:
> depot_tools: Use vpython to execute fetch.
>
> Bug: 1002153
> Change-Id: I11286bebc23bedada239d6ddb8ebb86207a41485
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1815707
> Reviewed-by: Anthony Polito <apolito@google.com>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
> Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>

Bug: 1002153
Change-Id: I20dbec88a030e0de201eaac88147e83028505102
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1854750Reviewed-by: Andrii Shyshkalov <tandrii@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>