Index: src/wp-admin/includes/noop.php
===================================================================
--- src/wp-admin/includes/noop.php	(revision 47001)
+++ src/wp-admin/includes/noop.php	(working copy)
@@ -55,6 +55,11 @@
 /**
  * @ignore
  */
+function do_action() {}
+
+/**
+ * @ignore
+ */
 function do_action_ref_array() {}
 
 /**
Index: src/wp-includes/class.wp-scripts.php
===================================================================
--- src/wp-includes/class.wp-scripts.php	(revision 47001)
+++ src/wp-includes/class.wp-scripts.php	(working copy)
@@ -162,9 +162,9 @@
 		 *
 		 * @since 2.6.0
 		 *
-		 * @param WP_Scripts $this WP_Scripts instance (passed by reference).
+		 * @param WP_Scripts $this WP_Scripts instance.
 		 */
-		do_action_ref_array( 'wp_default_scripts', array( &$this ) );
+		do_action( 'wp_default_scripts', $this );
 	}
 
 	/**
Index: src/wp-includes/class.wp-styles.php
===================================================================
--- src/wp-includes/class.wp-styles.php	(revision 47001)
+++ src/wp-includes/class.wp-styles.php	(working copy)
@@ -130,9 +130,9 @@
 		 *
 		 * @since 2.6.0
 		 *
-		 * @param WP_Styles $this WP_Styles instance (passed by reference).
+		 * @param WP_Styles $this WP_Styles instance.
 		 */
-		do_action_ref_array( 'wp_default_styles', array( &$this ) );
+		do_action( 'wp_default_styles', $this );
 	}
 
 	/**