Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

core/modules/views/js/views-contextual.js

@@ -1,28 +0,0 @@
-/**
- * @file
- * Javascript related to contextual links.
- */
-
-(function ($) {
-
-  "use strict";
-
-  /**
-   * Attaches contextual region classes to views elements.
-   *
-   * @type {Drupal~behavior}
-   *
-   * @prop {Drupal~behaviorAttach} attach
-   *   Adds class `contextual-region` to views elements.
-   */
-  Drupal.behaviors.viewsContextualLinks = {
-    attach: function (context) {
-      var id = $('body').attr('data-views-page-contextual-id');
-
-      $('[data-contextual-id="' + id + '"]')
-        .closest(':has(.view)')
-        .addClass('contextual-region');
-    }
-  };
-
-})(jQuery);