Covering our XSS bases

git-svn-id: https://develop.svn.wordpress.org/trunk@9233 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/plugin-install.php

@@ -52,7 +52,7 @@ do_action('install_plugins_pre_' . $tab); //Used to override the general interfa
 include('admin-header.php');
 ?>
 <div class="wrap">
-<h2><?php echo $title ?></h2> 
+<h2><?php echo wp_specialchars( $title ); ?></h2> 
 
 	<ul class="subsubsub">
 <?php