Remove all screen_icon() calls and deprecate the functions, props TobiasBg, fixes #26119

Built from https://develop.svn.wordpress.org/trunk@26518


git-svn-id: http://core.svn.wordpress.org/trunk@26411 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/network/upgrade.php

@@ -39,7 +39,6 @@ if ( ! current_user_can( 'manage_network' ) )
 	wp_die( __( 'You do not have permission to access this page.' ) );
 
 echo '<div class="wrap">';
-screen_icon('tools');
 echo '<h2>' . __( 'Upgrade Network' ) . '</h2>';
 
 $action = isset($_GET['action']) ? $_GET['action'] : 'show';