Enable test for git_rebase_update on Windows

R=ehmaldonado@chromium.org

Change-Id: Ie801df1cef3d36fbfe6ba9fbd922bff4cf03a006
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2123867Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>

PRESUBMIT.py

@@ -80,7 +80,6 @@ def CommonChecks(input_api, output_api, tests_to_black_list, run_on_python3):
         r'.*git_common_test\.py$',
         r'.*git_hyper_blame_test\.py$',
         r'.*git_map_test\.py$',
-        r'.*git_rebase_update_test\.py$',
         r'.*ninjalog_uploader_test\.py$',
         r'.*recipes_test\.py$',
         r'.*roll_dep_test\.py$',