code: public PubsubFuture<Void> deleteSubscription(final String project,
                                                 final String subscription) {
      return deleteSubscription(canonicalSubscription(project, subscription));
    }
docs: Delete a Pub/Sub subscription.
  
  @param project      The Google Cloud project.
  @param subscription The name of the subscription to delete.
  @return A future that is completed when this request is completed. The future will be completed with {@code null}
  if the response is 404.