[DevTools] Cleanup DOMExtension.js.

third_party/WebKit/Source/devtools/front_end/network/BlockedURLsPane.js

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  */
 WebInspector.BlockedURLsPane = function()
 {
     WebInspector.VBox.call(this, true);
     this.registerRequiredCSS("network/blockedURLsPane.css");
     this.contentElement.classList.add("blocked-urls-pane");
 
     WebInspector.BlockedURLsPane._instance = this;
 
     this._blockedURLsSetting = WebInspector.moduleSetting("blockedURLs");
     this._blockedURLsSetting.addChangeListener(this._update, this);
 
     this._toolbar = new WebInspector.Toolbar("", this.contentElement);
-    this._toolbar.element.addEventListener("click", consumeEvent);
+    this._toolbar.element.addEventListener("click", (e) => e.consume());
     var addButton = new WebInspector.ToolbarButton(WebInspector.UIString("Add pattern"), "add-toolbar-item");
     addButton.addEventListener("click", this._addButtonClicked.bind(this));
     this._toolbar.appendToolbarItem(addButton);
     var clearButton = new WebInspector.ToolbarButton(WebInspector.UIString("Remove all"), "clear-toolbar-item");
     clearButton.addEventListener("click", this._removeAll.bind(this));
     this._toolbar.appendToolbarItem(clearButton);
 
     this._emptyElement = this.contentElement.createChild("div", "no-blocked-urls");
     this._emptyElement.createChild("span").textContent = WebInspector.UIString("Requests are not blocked. ");
     var addLink = this._emptyElement.createChild("span", "link");
@@ skipping 270 matching lines @@
      * @param {string} actionId
      * @return {boolean}
      */
     handleAction: function(context, actionId)
     {
         WebInspector.viewManager.showView("network.blocked-urls");
         return true;
     }
 }