code: @BetaApi
    public final Operation deleteSignedUrlKeyBackendBucket(
        ProjectGlobalBackendBucketName backendBucket, String keyName) {
  
      DeleteSignedUrlKeyBackendBucketHttpRequest request =
          DeleteSignedUrlKeyBackendBucketHttpRequest.newBuilder()
              .setBackendBucket(backendBucket == null ? null : backendBucket.toString())
              .setKeyName(keyName)
              .build();
      return deleteSignedUrlKeyBackendBucket(request);
    }
docs: Deletes a key for validating requests with signed URLs for this backend bucket.
  
  <p>Sample code:
  
  <pre><code>
  try (BackendBucketClient backendBucketClient = BackendBucketClient.create()) {
  ProjectGlobalBackendBucketName backendBucket = ProjectGlobalBackendBucketName.of("[PROJECT]", "[BACKEND_BUCKET]");
  String keyName = "";
  Operation response = backendBucketClient.deleteSignedUrlKeyBackendBucket(backendBucket, keyName);
  }
  </code></pre>
  
  @param backendBucket Name of the BackendBucket resource to which the Signed URL Key should be
  added. The name should conform to RFC1035.
  @param keyName The name of the Signed URL Key to delete.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails