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

third_party/WebKit/Source/devtools/front_end/main/Main.js

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 657 matching lines @@
   }
 };
 
 /**
  * @implements {UI.ToolbarItem.Provider}
  * @unrestricted
  */
 Main.Main.MainMenuItem = class {
   constructor() {
     this._item = new UI.ToolbarButton(Common.UIString('Customize and control DevTools'), 'largeicon-menu');
-    this._item.addEventListener(UI.ToolbarButton.Events.MouseDown, this._mouseDown, this);
+    this._item.addEventListener('mousedown', this._mouseDown, this);
   }
 
   /**
    * @override
    * @return {?UI.ToolbarItem}
    */
   item() {
     return this._item;
   }
 
@@ skipping 11 matching lines @@
       titleElement.textContent = Common.UIString('Dock side');
       var toggleDockSideShorcuts = UI.shortcutRegistry.shortcutDescriptorsForAction('main.toggle-dock');
       titleElement.title = Common.UIString(
           'Placement of DevTools relative to the page. (%s to restore last position)', toggleDockSideShorcuts[0].name);
       dockItemElement.appendChild(titleElement);
       var dockItemToolbar = new UI.Toolbar('', dockItemElement);
       dockItemToolbar.makeBlueOnHover();
       var undock = new UI.ToolbarToggle(Common.UIString('Undock into separate window'), 'largeicon-undock');
       var bottom = new UI.ToolbarToggle(Common.UIString('Dock to bottom'), 'largeicon-dock-to-bottom');
       var right = new UI.ToolbarToggle(Common.UIString('Dock to right'), 'largeicon-dock-to-right');
-      undock.addEventListener(
-          UI.ToolbarButton.Events.MouseUp, setDockSide.bind(null, Components.DockController.State.Undocked));
-      bottom.addEventListener(
-          UI.ToolbarButton.Events.MouseUp, setDockSide.bind(null, Components.DockController.State.DockedToBottom));
-      right.addEventListener(
-          UI.ToolbarButton.Events.MouseUp, setDockSide.bind(null, Components.DockController.State.DockedToRight));
+      undock.addEventListener('mouseup', setDockSide.bind(null, Components.DockController.State.Undocked));
+      bottom.addEventListener('mouseup', setDockSide.bind(null, Components.DockController.State.DockedToBottom));
+      right.addEventListener('mouseup', setDockSide.bind(null, Components.DockController.State.DockedToRight));
       undock.setToggled(Components.dockController.dockSide() === Components.DockController.State.Undocked);
       bottom.setToggled(Components.dockController.dockSide() === Components.DockController.State.DockedToBottom);
       right.setToggled(Components.dockController.dockSide() === Components.DockController.State.DockedToRight);
       dockItemToolbar.appendToolbarItem(undock);
       dockItemToolbar.appendToolbarItem(bottom);
       dockItemToolbar.appendToolbarItem(right);
       contextMenu.appendCustomItem(dockItemElement);
       contextMenu.appendSeparator();
     }
 
@@ skipping 250 matching lines @@
    * @override
    * @return {?Element}
    */
   settingElement() {
     return UI.SettingsUI.createSettingCheckbox(
         Common.UIString('Show rulers'), Common.moduleSetting('showMetricsRulers'));
   }
 };
 
 new Main.Main();