Remove unused code.

public/main/social/download_my_files.php

@@ -1,30 +0,0 @@
-<?php
-/* For licensing terms, see /license.txt */
-
-require_once __DIR__.'/../inc/global.inc.php';
-
-$userId = isset($_GET['user_id']) ? (int) $_GET['user_id'] : 0;
-$file = isset($_GET['file']) ? $_GET['file'] : '';
-
-if (empty($userId) || empty($file)) {
-    exit;
-}
-
-$dir = UserManager::getUserPathById($userId, 'system');
-if (empty($dir)) {
-    exit;
-}
-$file = $dir.'/my_files/'.$file;
-
-$config = api_get_configuration_value('block_my_files_access');
-
-if ($config) {
-    api_block_anonymous_users();
-}
-
-if (Security::check_abs_path($file, $dir.'my_files/')) {
-    $result = DocumentManager::file_send_for_download($file);
-    if (false === $result) {
-        exit;
-    }
-}