Otherwise this fails on Windows because git_cl.py "is not a valid Win32
application".

R=gbeaty@google.com, iannucci@google.com

Bug: 726111
Change-Id: I4b9fea6b5271241e14407aeab175ce73d1ee8349

Recipe-Nontrivial-Roll: chromiumos
Recipe-Nontrivial-Roll: build_limited_scripts_slave
Recipe-Nontrivial-Roll: release_scripts
Recipe-Nontrivial-Roll: infra
Change-Id: I4b9fea6b5271241e14407aeab175ce73d1ee8349
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1835598
Commit-Queue: Michael Moss <mmoss@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>