Windows doesn't work with shebang.

Fixed: 1289707
Change-Id: I9db5f550d7ab5d2f92ccac392c3a5ee9595a9bf6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3406711
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Fumitoshi Ukai <ukai@google.com>
Commit-Queue: Fumitoshi Ukai <ukai@google.com>