code: static AdGroupCriterion createCriterionForRemove(ProductPartitionNode node,
        long adGroupId) {
      Preconditions.checkNotNull(node, "Null node");
  
      AdGroupCriterion adGroupCriterion = new AdGroupCriterion();
      adGroupCriterion.setAdGroupId(adGroupId);
      adGroupCriterion.setCriterion(new ProductPartition());
      adGroupCriterion.getCriterion().setId(node.getProductPartitionId());
  
      return adGroupCriterion;
    }
docs: Returns a new AdGroupCriterion configured for a REMOVE operation.
  
  @param node the node whose criterion should be removed
  @param adGroupId the ad group ID of the criterion