code: @Override
      public DeleteChapCredentialsResult deleteChapCredentials(DeleteChapCredentialsRequest request) {
          request = beforeClientExecution(request);
          return executeDeleteChapCredentials(request);
      }
docs: <p>
  Deletes Challenge-Handshake Authentication Protocol (CHAP) credentials for a specified iSCSI target and initiator
  pair.
  </p>
  
  @param deleteChapCredentialsRequest
  A JSON object containing one or more of the following fields:</p>
  <ul>
  <li>
  <p>
  <a>DeleteChapCredentialsInput$InitiatorName</a>
  </p>
  </li>
  <li>
  <p>
  <a>DeleteChapCredentialsInput$TargetARN</a>
  </p>
  </li>
  @return Result of the DeleteChapCredentials operation returned by the service.
  @throws InvalidGatewayRequestException
  An exception occurred because an invalid gateway request was issued to the service. For more information,
  see the error and message fields.
  @throws InternalServerErrorException
  An internal server error has occurred during the request. For more information, see the error and message
  fields.
  @sample AWSStorageGateway.DeleteChapCredentials
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/DeleteChapCredentials"
  target="_top">AWS API Documentation</a>