--- a/testing/marionette/action.js
+++ b/testing/marionette/action.js
@@ -1,26 +1,22 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
 
-Cu.import("resource://gre/modules/Log.jsm");
-
+Cu.import("chrome://marionette/content/assert.js");
 Cu.import("chrome://marionette/content/element.js");
 Cu.import("chrome://marionette/content/error.js");
 
-
 this.EXPORTED_SYMBOLS = ["action"];
 
-const logger = Log.repository.getLogger("Marionette");
-
 // TODO? With ES 2016 and Symbol you can make a safer approximation
 // to an enum e.g. https://gist.github.com/xmlking/e86e4f15ec32b12c4689
 /**
  * Implements WebDriver Actions API: a low-level interfac for providing
  * virtualised device input to the web browser.
  */
 this.action = {
   Pause: "pause",