operation.setOperator(Operator.REMOVE);
AdGroupCriterionOperation[] operations = new AdGroupCriterionOperation[] {operation};
// Delete ad group criteria.
AdGroupCriterionReturnValue result = adGroupCriterionService.mutate(operations);
// Display ad group criteria.
for (AdGroupCriterion adGroupCriterionResult : result.getValue()) {
System.out.println("Ad group criterion with ad group id \""
+ adGroupCriterionResult.getAdGroupId() + "\", criterion id \""