message: Remove use of target_ops.
diff: @@ -170,7 +170,7 @@ def _convert_tf1_model(flags):
  converter.allow_custom_ops = flags.allow_custom_ops
  if flags.target_ops:
  ops_set_options = lite.OpsSet.get_options()
  - converter.target_ops = set()
  + converter.target_spec.supported_ops = set()
  for option in flags.target_ops.split(","):
  if option not in ops_set_options:
  raise ValueError("Invalid value for --target_ops. Options: "
  