message: tools: Fix gn_check_autofix.py with Python3
  Cr-Commit-Position: refs/heads/main@{#36425}
diff: @@ -165,7 +165,7 @@ def main():
  return 1
  for error in errors:
  - error = error.split('\\n')
  + error = error.split('\n')
  target_msg = 'The target:'
  if target_msg not in error:
  target_msg = 'It is not in any dependency of'
  