code: @Override
      public DeleteActivityResult deleteActivity(DeleteActivityRequest request) {
          request = beforeClientExecution(request);
          return executeDeleteActivity(request);
      }
docs: <p>
  Deletes an activity.
  </p>
  
  @param deleteActivityRequest
  @return Result of the DeleteActivity operation returned by the service.
  @throws InvalidArnException
  The provided Amazon Resource Name (ARN) is invalid.
  @sample AWSStepFunctions.DeleteActivity
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/states-2016-11-23/DeleteActivity" target="_top">AWS API
  Documentation</a>