Revert of Fix bootstrap on windows (patchset #2 id:20001 of https://codereview.chromium.org/2136303002/ )
Revert of Fix bootstrap on windows (patchset #2 id:20001 of https://codereview.chromium.org/2136303002/ )

Reason for revert:
Appears to have broken the roller... :(

Original issue's description:
> Fix bootstrap on windows
>
> Also uses ROOT_DIR instead of hardcoding the value.
>
> R=dnj
>
> Committed: https://github.com/luci/recipes-py/commit/ce485a8a394dcc1561b5ecdd337a85002083de5b

TBR=dnj@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2139103002

luci/recipes-py,luci/recipes-py