wordpress widgets custom menu ul li a customization

// source link: http://wordpress.stackexchange.com/questions/125122/how-to-avoid-the-div-and-ul-which-added-when-custon-menu-widget-is-used

// wordpress widgets custom menu ul li a update

/**
 * WTI Custom Navigation Menu widget class
 *
 * @since 3.0.0
 */

class Wti_Custom_Nav_Menu_Widget extends WP_Widget {

    function __construct() {
        $widget_ops = array( 'description' => __('Use this widget to add one of your custom menus as a widget.') );
        parent::__construct( 'custom_nav_menu', __('WTI Custom Menu'), $widget_ops );
    }

    function widget($args, $instance) {
        // Get menu
        $nav_menu = ! empty( $instance['nav_menu'] ) ? wp_get_nav_menu_object( $instance['nav_menu'] ) : false;

        if ( !$nav_menu )
            return;

        $instance['title'] = apply_filters( 'widget_title', empty( $instance['title'] ) ? '' : $instance['title'], $instance, $this->id_base );

        echo $args['before_widget'];

        if ( !empty($instance['title']) )
            echo $args['before_title'] . $instance['title'] . $args['after_title'];

        wp_nav_menu(
                array(
                    'fallback_cb' => '',
                    'container' => '',
                    'menu_class' => $instance['menu_class'],
                    'menu' => $nav_menu
                )
            );

        echo $args['after_widget'];
    }

    function update( $new_instance, $old_instance ) {
        $instance['title'] = strip_tags ( stripslashes ( $new_instance['title'] ) );
        $instance['menu_class'] = strip_tags ( stripslashes ( trim ( $new_instance['menu_class'] ) ) );
        $instance['nav_menu'] = (int) $new_instance['nav_menu'];

        return $instance;
    }

    function form( $instance ) {
        $title = isset( $instance['title'] ) ? $instance['title'] : '';
        $menu_class = isset( $instance['menu_class'] ) ? $instance['menu_class'] : '';
        $nav_menu = isset( $instance['nav_menu'] ) ? $instance['nav_menu'] : '';

        // Get menus
        $menus = get_terms( 'nav_menu', array( 'hide_empty' => false ) );

        // If no menus exists, direct the user to go and create some.
        if ( !$menus ) {
            echo '<p>'. sprintf( __('No menus have been created yet. <a href="%s">Create some</a>.'), admin_url('nav-menus.php') ) .'</p>';
            return;
        }
        ?>
        <p>
            <label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:') ?></label>
            <input type="text" class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" value="<?php echo $title; ?>" />
        </p>
        <p>
            <label for="<?php echo $this->get_field_id('menu_class'); ?>"><?php _e('Menu Class:') ?></label>
            <input type="text" class="widefat" id="<?php echo $this->get_field_id('menu_class'); ?>" name="<?php echo $this->get_field_name('menu_class'); ?>" value="<?php echo $menu_class; ?>" />
        </p>
        <p>
            <label for="<?php echo $this->get_field_id('nav_menu'); ?>"><?php _e('Select Menu:'); ?></label>
            <select id="<?php echo $this->get_field_id('nav_menu'); ?>" name="<?php echo $this->get_field_name('nav_menu'); ?>">
        <?php
            foreach ( $menus as $menu ) {
                echo '<option value="' . $menu->term_id . '"'
                    . selected( $nav_menu, $menu->term_id, false )
                    . '>'. $menu->name . '</option>';
            }
        ?>
            </select>
        </p>
        <?php
    }
}

function wti_custom_nav_menu_widget() {
    register_widget('Wti_Custom_Nav_Menu_Widget');
}

add_action ( 'widgets_init', 'wti_custom_nav_menu_widget', 1 );