Remove WP_SHOW_ADMIN_BAR and go off existing and new defines on page type. See #15315

git-svn-id: https://develop.svn.wordpress.org/trunk@16221 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/plugin-install.php

@@ -5,6 +5,9 @@
  * @package WordPress
  * @subpackage Administration
  */
+// TODO route this pages via a specific iframe handler instead of the do_action below
+if ( isset( $_GET['tab'] ) && ( 'plugin-information' == $_GET['tab'] ) )
+	define('IFRAME_REQUEST' , true);
 
 /** WordPress Administration Bootstrap */
 require_once('./admin.php');