Ticket #27626: disable-wp-check-browser-version.0.2.php

<?php
/*
Plugin Name: Disable wp_check_browser_version()
Version: 0.2
Plugin URI: https://core.trac.wordpress.org/ticket/27626
Description: Disables the check whether the user needs a browser update.
Author: Sergey Biryukov
Author URI: http://profiles.wordpress.org/sergeybiryukov/
*/

if ( ! empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
        add_filter( 'pre_site_transient_browser_' . md5( $_SERVER['HTTP_USER_AGENT'] ), '__return_null' );
}
?>