Drop BasketAction as it's not used anywhere

library/Icinga/Web/Widget/Tabextension/BasketAction.php

@@ -1,34 +0,0 @@
-<?php
-/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
-
-namespace Icinga\Web\Widget\Tabextension;
-
-use Icinga\Web\Widget\Tabs;
-use Icinga\Web\Url;
-
-/**
- * Tabextension that adds the basket command
- *
- * @TODO: Baskets are not supported in the codebase yet (Feature #4537)
- */
-class BasketAction implements Tabextension
-{
-    /**
-     * Applies the dashboard actions to the provided tabset
-     *
-     * @param   Tabs $tabs The tabs object to extend with
-     */
-    public function apply(Tabs $tabs)
-    {
-        $tabs->addAsDropdown(
-            'basket',
-            array(
-                'title'     => 'URL Basket',
-                'url'       => Url::fromPath('basket/add'),
-                'urlParams' => array(
-                    'url' => Url::fromRequest()->getRelativeUrl()
-                )
-            )
-        );
-    }
-}