DevTools: Code fixes for the Closure compiler roll

Source/devtools/front_end/elements/ElementsPanel.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * 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
@@ skipping 1212 matching lines @@
             var remoteObject = /** @type {!WebInspector.RemoteObject} */ (object);
             if (remoteObject.isNode())
                 commandCallback = remoteObject.reveal.bind(remoteObject);
         } else if (object instanceof WebInspector.DOMNode) {
             var domNode = /** @type {!WebInspector.DOMNode} */ (object);
             commandCallback = domNode.reveal.bind(domNode);
         }
         if (!commandCallback)
             return;
         // Skip adding "Reveal..." menu item for our own tree outline.
-        if (this.element.isAncestor(event.target))
+        if (this.element.isAncestor(/** @type {!Node} */ (event.target)))
             return;
         contextMenu.appendItem(WebInspector.useLowerCaseMenuTitles() ? "Reveal in Elements panel" : "Reveal in Elements Panel", commandCallback);
     },
 
     _sidebarContextMenuEventFired: function(event)
     {
         var contextMenu = new WebInspector.ContextMenu(event);
         contextMenu.show();
     },
 
@@ skipping 227 matching lines @@
         /**
          * @suppressReceiverCheck
          * @this {Element}
          */
         function parentElement()
         {
             return this.parentElement;
         }
     }
 }