This fixes default value for Windows platform. Unit tests still don't
work for Windows as CTRL+C handling is not working properly.

Change-Id: I11fd33279313bfd7a2070e90164da6cf9f63696e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2121555
Commit-Queue: Josip Sokcevic <sokcevic@google.com>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>