Note that on line 504 I also fixed the test on windows by allowing \. Also properly escaped /.

Errors:
C:\Google\depot_tools\tests\gclient_scm_test.py:42: SyntaxWarning: invalid escape sequence \[
  TIMESTAMP_RE = re.compile('\[[0-9]{1,2}:[0-9]{2}:[0-9]{2}\] (.*)', re.DOTALL)
C:\Google\depot_tools\tests\gclient_scm_test.py:504: SyntaxWarning: invalid escape sequence \.
  "breaking lock.*\.git/index\.lock")

Bug: 958138
Change-Id: I19ef98538a1c172d7139ca2d7097a7fbc33ebe80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1815866
Commit-Queue: Raul Tambre <raul@tambre.ee>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Auto-Submit: Raul Tambre <raul@tambre.ee>