Use Date.now() rather than new Date().getTime().

chrome/browser/resources/net_internals/time_util.js

 // Copyright (c) 2012 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.
 
 var timeutil = (function() {
   'use strict';
 
   /**
    * Offset needed to convert event times to Date objects.
    * Updated whenever constants are loaded.
@@ skipping 31 matching lines @@
   function convertTimeTicksToDate(timeTicks) {
     return new Date(convertTimeTicksToTime(timeTicks));
   }
 
   /**
    * Returns the current time.
    *
    * @return {number} Milliseconds since the Unix epoch.
    */
   function getCurrentTime() {
-    return (new Date()).getTime();
+    return Date.now();
   }
 
   /**
    * Adds an HTML representation of |date| to |parentNode|.
    *
    * @param {DomNode} parentNode The node that will contain the new node.
    * @param {Date} date The date to be displayed.
    * @return {DomNode} The new node containing the date/time.
    */
   function addNodeWithDate(parentNode, date) {
@@ skipping 36 matching lines @@
 
   return {
     setTimeTickOffset: setTimeTickOffset,
     convertTimeTicksToTime: convertTimeTicksToTime,
     convertTimeTicksToDate: convertTimeTicksToDate,
     getCurrentTime: getCurrentTime,
     addNodeWithDate: addNodeWithDate,
     dateToString: dateToString
   };
 })();