_removeFormDataSetInfo() {
        // Just in case, set the counter to 0
        this._decrementParentFormCounter();
        // Remove the form handler function from the FormHandlerFunction Map
        window.aNFormHandlerMap.delete(this._getFormHandlerKey());
        // Lastly, remove the dataset attributes
        this.parentForm.removeAttribute('data-an-count');
        this.parentForm.removeAttribute('data-an-form-handler');
    }
Remove the dataset attributes `data-an-count` and `data-an-form-handler` from the parent form element.

@private