Limit the number of captured events held by about:net-internals.

chrome/browser/resources/net_internals/index.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.
 
 <include src="util.js"/>
 <include src="table_printer.js"/>
 <include src="view.js"/>
 <include src="tab_switcher_view.js"/>
 <include src="import_view.js"/>
 <include src="capture_view.js"/>
 <include src="export_view.js"/>
 <include src="http_cache_view.js"/>
 <include src="test_view.js"/>
 <include src="hsts_view.js"/>
 <include src="browser_bridge.js"/>
+<include src="events_tracker.js"/>
 <include src="source_tracker.js"/>
 <include src="resizable_vertical_split_view.js"/>
 <include src="main.js"/>
 <include src="time_util.js"/>
 <include src="log_util.js"/>
 <include src="capture_status_view.js"/>
 <include src="loaded_status_view.js"/>
 <include src="halted_status_view.js"/>
 <include src="status_view.js"/>
 <include src="dns_view.js"/>
@@ skipping 15 matching lines @@
 <include src="service_providers_view.js"/>
 <include src="http_throttling_view.js"/>
 <include src="logs_view.js"/>
 <include src="prerender_view.js"/>
 <include src="chromeos_view.js"/>
 <include src="http_pipeline_view.js"/>
 
 document.addEventListener('DOMContentLoaded', function() {
   MainView.getInstance();  // from main.js
 });