Use javascript strict mode throughout a number of net-internals files.

chrome/browser/resources/net_internals/test_view.js

 // Copyright (c) 2011 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.
 
 /**
  * This view displays the progress and results from the "connection tester".
  *
  *   - Has an input box to specify the URL.
  *   - Has a button to start running the tests.
  *   - Shows the set of experiments that have been run so far, and their
  *     result.
  */
+var TestView = (function() {
+  'use strict';
 
-var TestView = (function() {
   // IDs for special HTML elements in test_view.html
-  const MAIN_BOX_ID = 'test-view-tab-content';
-  const URL_INPUT_ID = 'test-view-url-input';
-  const FORM_ID = 'test-view-connection-tests-form';
-  const SUMMARY_DIV_ID = 'test-view-summary';
+  var MAIN_BOX_ID = 'test-view-tab-content';
+  var URL_INPUT_ID = 'test-view-url-input';
+  var FORM_ID = 'test-view-connection-tests-form';
+  var SUMMARY_DIV_ID = 'test-view-summary';
 
   // We inherit from DivView.
   var superClass = DivView;
 
   /**
    * @constructor
    */
   function TestView() {
+    assertFirstConstructorCall(TestView);
+
     // Call superclass's constructor.
     superClass.call(this, MAIN_BOX_ID);
 
     this.urlInput_ = $(URL_INPUT_ID);
     this.summaryDiv_ = $(SUMMARY_DIV_ID);
 
     var form = $(FORM_ID);
     form.addEventListener('submit', this.onSubmitForm_.bind(this), false);
 
     // Register to test information as it's received.
@@ skipping 106 matching lines @@
      * Callback for when the last test in the suite has finished.
      */
     onCompletedConnectionTestSuite: function() {
       var p = addNode(this.summaryDiv_, 'p');
       addTextNode(p, 'Completed connection test suite suite');
     }
   };
 
   return TestView;
 })();