message: make sure DomHelper doesn't get overriden
diff: /*eslint-disable no-undef*/
  +goog.require("goog.debug");
  goog.require("goog.dom");
  +goog.require("goog.dom.DomHelper");
  -export let bot = {};
  +var _d = goog.dom.DomHelper;
  +Object.defineProperty(goog.dom, "DomHelper", {
  + get: function () {
  + return _d;
  + },
  +
  + set: function (value) {
  + // disallow setting of the DomHelper as it will be voided
  + //_d = value;
  + }
  +});
  +
  +export var bot = {};
  goog.require("bot");
  goog.require("bot.action");
  goog.require("bot.events");
  @@ -38,7 +52,7 @@ bot.getDocument = function() {
  return bot.window_.document;
  };
  -export let core = {};
  +export var core = {};
  goog.require("core.firefox");
  goog.require("core.events");
  goog.require("core.text");
  