Bug 1245153 - Use EventUtils.js from mochikit; r=pbrosset

testing/marionette/EventUtils.js has been converted to a JS module in
testing/marionette/event.js and its API has changed.  It was originally
a copy of testing/mochitest/tests/SimpleTest/EventUtils.js, and it should
be fine to use the original instead.

MozReview-Commit-ID: Exi9d5rEeOz

devtools/client/shared/frame-script-utils.js

@@ -3,14 +3,11 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
-var {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+var {classes: Cc, interfaces: Ci, utils: Cu} = Components;
 const {require, loader} = Cu.import("resource://devtools/shared/Loader.jsm", {});
 const promise = require("promise");
 loader.lazyImporter(this, "Task", "resource://gre/modules/Task.jsm", "Task");
-const subScriptLoader = Cc["@mozilla.org/moz/jssubscript-loader;1"]
-                          .getService(Ci.mozIJSSubScriptLoader);
-var EventUtils = {};
-subScriptLoader.loadSubScript("chrome://marionette/content/EventUtils.js", EventUtils);
+
 loader.lazyGetter(this, "nsIProfilerModule", () => {
   return Cc["@mozilla.org/tools/profiler;1"].getService(Ci.nsIProfiler);
 });
@@ -180,20 +177,6 @@ addMessageListener("devtools:test:setAttribute", function(msg) {
   sendAsyncMessage("devtools:test:setAttribute");
 });
 
-/**
- * Synthesize a key event for an element. This handler doesn't send a message
- * back. Consumers should listen to specific events on the inspector/highlighter
- * to know when the event got synthesized.
- * @param  {Object} msg The msg.data part expects the following properties:
- * - {String} key
- * - {Object} options
- */
-addMessageListener("Test:SynthesizeKey", function(msg) {
-  let {key, options} = msg.data;
-
-  EventUtils.synthesizeKey(key, options, content);
-});
-
 /**
  * Like document.querySelector but can go into iframes too.
  * ".container iframe || .sub-container div" will first try to find the node