Menus: Add `social` as tertiary mapping group

Allows mapping of all social menus that include the term `social` in their slug.

See #39692.

Built from https://develop.svn.wordpress.org/trunk@41801


git-svn-id: http://core.svn.wordpress.org/trunk@41635 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/nav-menu.php

@@ -1119,6 +1119,7 @@ function wp_map_nav_menu_locations( $new_nav_menu_locations, $old_nav_menu_locat
 	$common_slug_groups = array(
 		array( 'header', 'main', 'navigation', 'primary', 'top' ),
 		array( 'bottom', 'footer', 'secondary', 'subsidiary' ),
+		array( 'social' ),
 	);
 
 	// Go through each group...

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-beta1-41800';
+$wp_version = '4.9-beta1-41801';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.