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

third_party/WebKit/Source/devtools/front_end/ui/SplitWidget.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:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 814 matching lines @@
     this._forceUpdateLayout();
   }
 
   /**
    * @param {string} title
    * @return {!UI.ToolbarButton}
    */
   createShowHideSidebarButton(title) {
     this._showHideSidebarButtonTitle = Common.UIString(title);
     this._showHideSidebarButton = new UI.ToolbarButton('', '');
-    this._showHideSidebarButton.addEventListener(UI.ToolbarButton.Events.Click, buttonClicked, this);
+    this._showHideSidebarButton.addEventListener('click', buttonClicked.bind(this));
     this._updateShowHideSidebarButton();
 
     /**
      * @param {!Common.Event} event
      * @this {UI.SplitWidget}
      */
     function buttonClicked(event) {
       if (this._showMode !== UI.SplitWidget.ShowMode.Both)
         this.showBoth(true);
       else
@@ skipping 33 matching lines @@
   OnlySidebar: 'OnlySidebar'
 };
 
 /** @enum {symbol} */
 UI.SplitWidget.Events = {
   SidebarSizeChanged: Symbol('SidebarSizeChanged'),
   ShowModeChanged: Symbol('ShowModeChanged')
 };
 
 UI.SplitWidget.MinPadding = 20;