code: public boolean deleteDefaultBucketAcl(String bucketName) {
      // [START deleteDefaultBucketAcl]
      boolean deleted = storage.deleteDefaultAcl(bucketName, User.ofAllAuthenticatedUsers());
      if (deleted) {
        // the acl entry was deleted
      } else {
        // the acl entry was not found
      }
      // [END deleteDefaultBucketAcl]
      return deleted;
    }
docs: [VARIABLE "my_unique_bucket"]