Index: wp-includes/functions.wp-scripts.php
===================================================================
--- wp-includes/functions.wp-scripts.php	(revision 19177)
+++ wp-includes/functions.wp-scripts.php	(working copy)
@@ -64,6 +64,16 @@
 }
 
 /**
+ * Wrapper for wp_add_script_data()
+ *
+ * @since r16
+ * @see wp_add_script_data()
+ */
+function wp_localize_script( $handle, $name, $data ) {
+	return wp_add_script_data( $handle, $name, $data );
+}
+
+/**
  * Adds extra Javascript data.
  *
  * Works only if the script has already been added.
@@ -78,10 +88,10 @@
  * the object would contain all values. In that case if two or more keys are the same,
  * the last value overwrites the previous. The function is named "localize_script" because of historical reasons.
  *
- * @since r16
+ * @since 3.3
  * @see WP_Scripts::add_script_data()
  */
-function wp_localize_script( $handle, $name, $data ) {
+function wp_add_script_data( $handle, $name, $data ) {
 	global $wp_scripts;
 	if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
 		if ( ! did_action( 'init' ) )
Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 19177)
+++ wp-includes/script-loader.php	(working copy)
@@ -498,7 +498,7 @@
  */
 function wp_just_in_time_script_localization() {
 
-	wp_localize_script( 'autosave', 'autosaveL10n', array(
+	wp_add_script_data( 'autosave', 'autosaveL10n', array(
 		'autosaveInterval' => AUTOSAVE_INTERVAL,
 		'savingText' => __('Saving Draft…'),
 		'saveAlert' => __('The changes you made will be lost if you navigate away from this page.')