+/**
+ * Executes changes made in WordPress 4.5.0.
+ *
+ * @ignore
+ * @since 4.5.0
+ *
+ * @global int $wp_current_db_version Current database version.
+ * @global wpdb $wpdb WordPress database abstraction object.
+ */
+function upgrade_450() {
+ global $wp_current_db_version, $wpdb;
+
+ if ( $wp_current_db_version < 36180 ) {
+ wp_clear_scheduled_hook( 'wp_maybe_auto_update' );
+ }
+
+ // Remove unused email confirmation options, moved to usermeta.
+ if ( $wp_current_db_version < 36679 && is_multisite() ) {
+ $wpdb->query( "DELETE FROM $wpdb->options WHERE option_name REGEXP '^[0-9]+_new_email$'" );
+ }
+
+ // Remove unused user setting for wpLink.
+ delete_user_setting( 'wplink' );
+}
+