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

third_party/WebKit/Source/devtools/front_end/resources/ApplicationCacheItemsView.js

 /*
  * Copyright (C) 2010 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 Resources.ApplicationCacheItemsView = class extends UI.SimpleView {
   constructor(model, frameId) {
     super(Common.UIString('AppCache'));
 
     this._model = model;
 
     this.element.classList.add('storage-view', 'table');
 
     this._deleteButton = new UI.ToolbarButton(Common.UIString('Delete'), 'largeicon-delete');
     this._deleteButton.setVisible(false);
-    this._deleteButton.addEventListener(UI.ToolbarButton.Events.Click, this._deleteButtonClicked, this);
+    this._deleteButton.addEventListener('click', this._deleteButtonClicked, this);
 
     this._connectivityIcon = createElement('label', 'dt-icon-label');
     this._connectivityIcon.style.margin = '0 2px 0 5px';
     this._statusIcon = createElement('label', 'dt-icon-label');
     this._statusIcon.style.margin = '0 2px 0 5px';
 
     this._frameId = frameId;
 
     this._emptyWidget = new UI.EmptyWidget(Common.UIString('No Application Cache information available.'));
     this._emptyWidget.show(this.element);
@@ skipping 182 matching lines @@
       if (resource === selectedResource) {
         nodeToSelect = node;
         nodeToSelect.selected = true;
       }
     }
 
     if (!nodeToSelect && this._dataGrid.rootNode().children.length)
       this._dataGrid.rootNode().children[0].selected = true;
   }
 
-  /**
-   * @param {!Common.Event} event
-   */
   _deleteButtonClicked(event) {
     if (!this._dataGrid || !this._dataGrid.selectedNode)
       return;
 
     // FIXME: Delete Button semantics are not yet defined. (Delete a single, or all?)
     this._deleteCallback(this._dataGrid.selectedNode);
   }
 
   _deleteCallback(node) {
     // FIXME: Should we delete a single (selected) resource or all resources?
     // InspectorBackend.deleteCachedResource(...)
     // this._update();
   }
 };