Lines:

<?php

/**
 * WordPress core upgrade functionality.
 *
 * @package WordPress
 * @subpackage Administration
 * @since 2.7.0
 */


/**
 * Stores files to be deleted.
 *
 * @since 2.7.0
 *
 * @global array $_old_files
 * @var array
 * @name $_old_files
 */
global $_old_files;

$_old_files = array(
  // 2.0
  'wp-admin/import-b2.php',
  'wp-admin/import-blogger.php',
  'wp-admin/import-greymatter.php',
  'wp-admin/import-livejournal.php',
  'wp-admin/import-mt.php',
  'wp-admin/import-rss.php',
  'wp-admin/import-textpattern.php',
  'wp-admin/quicktags.js',
  'wp-images/fade-butt.png',
  'wp-images/get-firefox.png',
  'wp-images/header-shadow.png',
  'wp-images/smilies',
  'wp-images/wp-small.png',
  'wp-images/wpminilogo.png',
  'wp.php',
  // 2.0.8
  'wp-includes/js/tinymce/plugins/inlinepopups/readme.txt',
  // 2.1
  'wp-admin/edit-form-ajax-cat.php',
  'wp-admin/execute-pings.php',
  'wp-admin/inline-uploading.php',
  'wp-admin/link-categories.php',
  'wp-admin/list-manipulation.js',
  'wp-admin/list-manipulation.php',
  'wp-includes/comment-functions.php',
  'wp-includes/feed-functions.php',
  'wp-includes/functions-compat.php',
  'wp-includes/functions-formatting.php',
  'wp-includes/functions-post.php',
  'wp-includes/js/dbx-key.js',
  'wp-includes/js/tinymce/plugins/autosave/langs/cs.js',
  'wp-includes/js/tinymce/plugins/autosave/langs/sv.js',
  'wp-includes/links.php',
  'wp-includes/pluggable-functions.php',
  'wp-includes/template-functions-author.php',
  'wp-includes/template-functions-category.php',
  'wp-includes/template-functions-general.php',
  'wp-includes/template-functions-links.php',
  'wp-includes/template-functions-post.php',
  'wp-includes/wp-l10n.php',
  // 2.2
  'wp-admin/cat-js.php',
  'wp-admin/import/b2.php',
  'wp-includes/js/autosave-js.php',
  'wp-includes/js/list-manipulation-js.php',
  'wp-includes/js/wp-ajax-js.php',
  // 2.3
  'wp-admin/admin-db.php',
  'wp-admin/cat.js',
  'wp-admin/categories.js',
  'wp-admin/custom-fields.js',
  'wp-admin/dbx-admin-key.js',
  'wp-admin/edit-comments.js',
  'wp-admin/install-rtl.css',
  'wp-admin/install.css',
  'wp-admin/upgrade-schema.php',
  'wp-admin/upload-functions.php',
  'wp-admin/upload-rtl.css',
  'wp-admin/upload.css',
  'wp-admin/upload.js',
  'wp-admin/users.js',
  'wp-admin/widgets-rtl.css',
  'wp-admin/widgets.css',
  'wp-admin/xfn.js',
  'wp-includes/js/tinymce/license.html',
  // 2.5
  'wp-admin/css/upload.css',
  'wp-admin/images/box-bg-left.gif',
  'wp-admin/images/box-bg-right.gif',
  'wp-admin/images/box-bg.gif',
  'wp-admin/images/box-butt-left.gif',
  'wp-admin/images/box-butt-right.gif',
  'wp-admin/images/box-butt.gif',
  'wp-admin/images/box-head-left.gif',
  'wp-admin/images/box-head-right.gif',
  'wp-admin/images/box-head.gif',

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