def _RemoveLabels(existing_labels, labels_to_remove):
  """Removes labels in labels_to_remove from existing_labels.

  Args:
    existing_labels: list of (k,v) pairs, existing labels.
    labels_to_remove: list of (k, v) pairs, labels to remove.

  Returns:
    List of remaining labels after removal.
  """
  return [label for label in existing_labels if label not in labels_to_remove]