message: Escape windows specific paths generated by os.path.join so that it works with regex.
  Note that this will work on all platforms but is critical for windows due to the use backslash in the filesystem.
  Cr-Commit-Position: refs/heads/main@{#35982}
diff: @@ -1231,9 +1231,8 @@ def CheckOrphanHeaders(input_api, output_api, source_file_filter):
  # eval-ed and thus doesn't have __file__.
  error_msg = """{} should be listed in {}."""
  results = []
  - exempt_paths = [
  - os.path.join('tools_webrtc', 'ios', 'SDK'),
  - ]
  + exempt_paths = [re.escape(os.path.join('tools_webrtc', 'ios', 'SDK'))]
  +
  with _AddToPath(
  input_api.os_path.join(input_api.PresubmitLocalPath(), 'tools_webrtc',
  'presubmit_checks_lib')):
  