Revert of [DevTools] Remove methods on Common.Event.

third_party/WebKit/Source/devtools/front_end/extensions/ExtensionPanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 115 matching lines @@
    * @param {!Extensions.ExtensionServer} server
    * @param {string} id
    * @param {string} iconURL
    * @param {string=} tooltip
    * @param {boolean=} disabled
    */
   constructor(server, id, iconURL, tooltip, disabled) {
     this._id = id;
 
     this._toolbarButton = new UI.ToolbarButton('', '');
-    this._toolbarButton.addEventListener(
-        UI.ToolbarButton.Events.Click, server.notifyButtonClicked.bind(server, this._id));
+    this._toolbarButton.addEventListener('click', server.notifyButtonClicked.bind(server, this._id));
     this.update(iconURL, tooltip, disabled);
   }
 
   /**
    * @param {string} iconURL
    * @param {string=} tooltip
    * @param {boolean=} disabled
    */
   update(iconURL, tooltip, disabled) {
     if (typeof iconURL === 'string')
@@ skipping 131 matching lines @@
     this._objectPropertiesView.element.removeChildren();
     var section = new Components.ObjectPropertiesSection(object, title);
     if (!title)
       section.titleLessMode();
     section.expand();
     section.editable = false;
     this._objectPropertiesView.element.appendChild(section.element);
     callback();
   }
 };