Roles: map `add_users` cap to `promote_users` and remove it.

"Never used, will be removed." - The Ghost of 3.5 Nacin

Props Craig Ralston, renoirb.
Fixes #16719.


git-svn-id: https://develop.svn.wordpress.org/trunk@35507 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/schema.php

@@ -848,13 +848,6 @@ function populate_roles_300() {
 		$role->add_cap( 'update_core' );
 		$role->add_cap( 'list_users' );
 		$role->add_cap( 'remove_users' );
-
-		/*
-		 * Never used, will be removed. create_users or promote_users
-		 * is the capability you're looking for.
-		 */
-		$role->add_cap( 'add_users' );
-
 		$role->add_cap( 'promote_users' );
 		$role->add_cap( 'edit_theme_options' );
 		$role->add_cap( 'delete_themes' );

src/wp-includes/capabilities-functions.php

@@ -34,6 +34,7 @@ function map_meta_cap( $cap, $user_id ) {
 		$caps[] = 'remove_users';
 		break;
 	case 'promote_user':
+	case 'add_users':
 		$caps[] = 'promote_users';
 		break;
 	case 'edit_user':