Ajax login fails after upgrade to 4.2.3

Hi.
I just updated WP and my custom login form stopped working. It works good in 4.2.2, but not in 4.2.3.

In functions.php i have:

function add_scripts() {
     wp_localize_script ('cool-main-script', 'ajax_login_object', array(
	  'ajaxurl' => admin_url( 'admin-ajax.php' ),
	  'redirecturl' => $_SERVER['REQUEST_URI'],
	  'loadingmessage' => __('Checking...')
     ));
}
add_action ('wp_enqueue_scripts', 'add_scripts' );
function ajax_login_init(){
	add_action( 'wp_ajax_nopriv_ajaxlogin', 'ajax_login' );
}
if (!is_user_logged_in()) {
	add_action('init', 'ajax_login_init');
}

function ajax_login(){
	check_ajax_referer( 'ajax-login-nonce', 'security' );

	$info = array();
	$info['user_login'] = $_POST['username'];
	$info['user_password'] = $_POST['password'];
	$info['remember'] = true;

	$user_signon = wp_signon( $info, false );
	if ( is_wp_error($user_signon) ){
	  echo json_encode(array('loggedin'=>false, 'message'=>__('Wrong')));
	} else {
	  echo json_encode(array('loggedin'=>true, 'message'=>__('Redirecting')));
	}
	die();
}

In .js file i have

jQuery(document).ready(function($){
//Ajax login
  $('.login_box #login').on('submit', function(e){
    $('.login_box .status_login').show().html(ajax_login_object.loadingmessage);
    $.ajax({
      type: 'POST',
      dataType: 'json',
      url: ajax_login_object.ajaxurl,
      data: {
        'action': 'ajaxlogin', //calls wp_ajax_nopriv_ajaxlogin
        'username': $('.login_box #username').val(),
        'password': $('.login_box #password').val(),
        'security': $('.login_box #security').val()
      },
      success: function(data){
        $('.login_box .status_login').html(data.message);
        if (data.loggedin == true){
          document.location.href = ajax_login_object.redirecturl;
        }
      }
    });
    e.preventDefault();
  });
});

The process stops at ‘Checking…’

As I can see wp-admin/includes/ajax-actions.php was revised. May be that’s the problem.
How to change the code to meet the new core?