In `attachment_submit_meta_box()`, remove dead code:

* `$action` doesn't need to be imported.
* `$can_publish` is set and never used, which means it doesn't need...
* `$post_type_object` or `$post_type`, which only served `$can_publish`.

See #27882.

Built from https://develop.svn.wordpress.org/trunk@28298


git-svn-id: http://core.svn.wordpress.org/trunk@28126 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/meta-boxes.php

@@ -276,11 +276,6 @@ if ( !in_array( $post->post_status, array('publish', 'future', 'private') ) || 0
  * @param object $post
  */
 function attachment_submit_meta_box( $post ) {
-	global $action;
-
-	$post_type = $post->post_type;
-	$post_type_object = get_post_type_object($post_type);
-	$can_publish = current_user_can($post_type_object->cap->publish_posts);
 ?>
 <div class="submitbox" id="submitpost">