[DevTools] Cleanup DOMExtension.js.

third_party/WebKit/Source/devtools/front_end/ui/SoftContextMenu.js

 /*
  * Copyright (C) 2011 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 43 matching lines @@
 
         // Create context menu.
         this.element = createElementWithClass("div", "soft-context-menu");
         var root = WebInspector.createShadowRootWithCoreStyles(this.element, "ui/softContextMenu.css");
         this._contextMenuElement = root.createChild("div");
         this.element.style.top = y + "px";
         var subMenuOverlap = 3;
         this.element.style.left = (this._parentMenu ? x - subMenuOverlap : x) + "px";
 
         this._contextMenuElement.tabIndex = 0;
-        this._contextMenuElement.addEventListener("mouseup", consumeEvent, false);
+        this._contextMenuElement.addEventListener("mouseup", (e) => e.consume(), false);
         this._contextMenuElement.addEventListener("keydown", this._menuKeyDown.bind(this), false);
 
         for (var i = 0; i < this._items.length; ++i)
             this._contextMenuElement.appendChild(this._createMenuItem(this._items[i]));
 
         // Install glass pane capturing events.
         if (!this._parentMenu) {
             this._glassPaneElement = createElementWithClass("div", "soft-context-menu-glass-pane fill");
             this._glassPaneElement.tabIndex = 0;
             this._glassPaneElement.style.zIndex = "20000";
@@ skipping 316 matching lines @@
     _discardSubMenus: function()
     {
         if (this._subMenu)
             this._subMenu._discardSubMenus();
         if (this.element)
             this.element.remove();
         if (this._parentMenu)
             delete this._parentMenu._subMenu;
     }
 }