twentytwelve-jeff child theme: functions.php

gistfile1.php

<?php

function twentytwelve_jeff_body_class( $classes ) {
    if(isset($_SERVER['HTTP_USER_AGENT'])) {
        if(strpos($_SERVER['HTTP_USER_AGENT'], "Chrome") !== false) {
            $classes = array_diff($classes, array('custom-font-enabled'));
        }
    }
    return $classes;
}
// priority = 20 makes this filter run after the one in twentytwelve                                                                              
add_filter( 'body_class', 'twentytwelve_jeff_body_class' , 20 );

?>