dropRequireFailure(otherRecognizer) {
    if (invokeArrayArg(otherRecognizer, 'dropRequireFailure', this)) {
      return this;
    }

    otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
    let index = inArray(this.requireFail, otherRecognizer);
    if (index > -1) {
      this.requireFail.splice(index, 1);
    }
    return this;
  }
@private
drop the requireFailure link. it does not remove the link on the other recognizer.
@param {Recognizer} otherRecognizer
@returns {Recognizer} this