Convert feeds_theme().

feeds.module

@@ -238,6 +238,7 @@ function feeds_theme() {
   return array(
     'feeds_upload' => array(
       'file' => 'feeds.pages.inc',
+      'render element' => 'element',
     ),
   );
 }

feeds.pages.inc

@@ -153,7 +153,8 @@ function feeds_fetcher_callback($importer, $feed_nid = 0) {
 /**
  * Theme upload widget.
  */
-function theme_feeds_upload($element) {
+function theme_feeds_upload($variables) {
+  $element = $variables['element'];
   drupal_add_css(drupal_get_path('module', 'feeds') .'/feeds.css');
   _form_set_class($element, array('form-file'));
   $description = '';