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

third_party/WebKit/Source/devtools/front_end/settings/SettingsScreen.js

 /*
  * Copyright (C) 2013 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 350 matching lines @@
     var element = createElementWithClass('div', 'file-system-container');
     var header = element.createChild('div', 'file-system-header');
 
     header.createChild('div', 'file-system-name').textContent = folderName;
     var path = header.createChild('div', 'file-system-path');
     path.textContent = fileSystemPath;
     path.title = fileSystemPath;
 
     var toolbar = new UI.Toolbar('');
     var button = new UI.ToolbarButton(Common.UIString('Remove'), 'largeicon-delete');
-    button.addEventListener(UI.ToolbarButton.Events.Click, this._removeFileSystemClicked.bind(this, fileSystem));
+    button.addEventListener('click', this._removeFileSystemClicked.bind(this, fileSystem));
     toolbar.appendToolbarItem(button);
     header.appendChild(toolbar.element);
 
     return element;
   }
 
   /**
    * @param {!Workspace.IsolatedFileSystem} fileSystem
    */
   _removeFileSystemClicked(fileSystem) {
@@ skipping 153 matching lines @@
         return;
       var settings = extension.descriptor()['settings'];
       if (settings && settings.indexOf(setting.name) !== -1) {
         InspectorFrontendHost.bringToFront();
         Settings.SettingsScreen._showSettingsScreen(extension.descriptor()['id']);
         success = true;
       }
     }
   }
 };