message: Finish migrating rtc_tools/testing to python3.
  No-Try: True
  Cr-Commit-Position: refs/heads/master@{#28689}
diff: @@ -76,7 +76,7 @@ def RemoveDirectory(*path):
  if sys.platform == 'win32':
  # Give up and use cmd.exe's rd command.
  file_path = os.path.normcase(file_path)
  - for _ in xrange(3):
  + for _ in range(3):
  print('RemoveDirectory running %s' % (' '.join(
  ['cmd.exe', '/c', 'rd', '/q', '/s', file_path])))
  if not subprocess.call(['cmd.exe', '/c', 'rd', '/q', '/s', file_path]):
  