[DevTools] Cleanup DOMExtension.js.

third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 1288 matching lines @@
      * @param {!Element} parentElement
      * @param {!Array.<!WebInspector.InvalidationTrackingEvent>} invalidations
      */
     _appendTruncatedNodeList: function(parentElement, invalidations)
     {
         var invalidationNodes = [];
         var invalidationNodeIdMap = {};
         for (var i = 0; i < invalidations.length; i++) {
             var invalidation = invalidations[i];
             var invalidationNode = this._createInvalidationNode(invalidation, false);
-            invalidationNode.addEventListener("click", consumeEvent, false);
+            invalidationNode.addEventListener("click", (e) => e.consume(), false);
             if (invalidationNode && !invalidationNodeIdMap[invalidation.nodeId]) {
                 invalidationNodes.push(invalidationNode);
                 invalidationNodeIdMap[invalidation.nodeId] = true;
             }
         }
 
         if (invalidationNodes.length === 1) {
             parentElement.appendChild(invalidationNodes[0]);
         } else if (invalidationNodes.length === 2) {
             parentElement.appendChild(invalidationNodes[0]);
@@ skipping 825 matching lines @@
     case warnings.V8Deopt:
         span.appendChild(WebInspector.linkifyURLAsNode("https://github.com/GoogleChrome/devtools-docs/issues/53",
             WebInspector.UIString("Not optimized"), undefined, true));
         span.createTextChild(WebInspector.UIString(": %s", eventData["deoptReason"]));
         break;
     default:
         console.assert(false, "Unhandled TimelineModel.WarningType");
     }
     return span;
 }