docs: def Clean():
    """Clean out compiled protos."""
    # Find all the compiled proto files and unlink them.
    for (root, _, files) in os.walk(ROOT):
      for filename in files:
        full_filename = os.path.join(root, filename)
        if full_filename.endswith("_pb2.py") or full_filename.endswith(
            "_pb2.pyc"):
          os.unlink(full_filename)