code: private DeleteInternetGatewayResponseType deleteInternetGateway(
              final String internetGatewayId) {
          DeleteInternetGatewayResponseType ret = new DeleteInternetGatewayResponseType();
          ret.setRequestId(UUID.randomUUID().toString());
          mockInternetGatewayController.deleteInternetGateway(internetGatewayId);
          return ret;
      }
docs: Handles "deleteInternetGateway" request to delete InternetGateway and returns response with a InternetGateway.
  @param internetGatewayId : Internet Gateway Id.
  @return a DeleteInternetGatewayResponseType with InternetGateway.