code: public void delete(String resourceGroupName, String privateZoneName, String ifMatch) {
          deleteWithServiceResponseAsync(resourceGroupName, privateZoneName, ifMatch).toBlocking().last().body();
      }
docs: Deletes a Private DNS zone. WARNING: All DNS records in the zone will also be deleted. This operation cannot be undone. Private DNS zone cannot be deleted unless all virtual network links to it are removed.
  
  @param resourceGroupName The name of the resource group.
  @param privateZoneName The name of the Private DNS zone (without a terminating dot).
  @param ifMatch The ETag of the Private DNS zone. Omit this value to always delete the current zone. Specify the last-seen ETag value to prevent accidentally deleting any concurrent changes.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent