Use map_meta_cap for multisite super admins in current_user_can_for_blog. props jamescollins, see #15122.

git-svn-id: https://develop.svn.wordpress.org/trunk@15812 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/capabilities.php

@@ -1089,9 +1089,6 @@ function current_user_can( $capability ) {
 function current_user_can_for_blog( $blog_id, $capability ) {
 	$current_user = wp_get_current_user();
 
-	if ( is_multisite() && is_super_admin() )
-		return true;
-
 	if ( empty( $current_user ) )
 		return false;