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

chrome/browser/resources/net_internals/http_throttling_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 information related to HTTP throttling.
  */
+var HttpThrottlingView = (function() {
+  'use strict';
 
-var HttpThrottlingView = (function() {
   // IDs for special HTML elements in http_throttling_view.html
-  const MAIN_BOX_ID = 'http-throttling-view-tab-content';
-  const ENABLE_CHECKBOX_ID = 'http-throttling-view-enable-checkbox';
+  var MAIN_BOX_ID = 'http-throttling-view-tab-content';
+  var ENABLE_CHECKBOX_ID = 'http-throttling-view-enable-checkbox';
 
   // We inherit from DivView.
   var superClass = DivView;
 
+  /**
+   * @constructor
+   */
   function HttpThrottlingView() {
+    assertFirstConstructorCall(HttpThrottlingView);
+
     // Call superclass's constructor.
     superClass.call(this, MAIN_BOX_ID);
 
     this.enableCheckbox_ = $(ENABLE_CHECKBOX_ID);
     this.enableCheckbox_.onclick = this.onEnableCheckboxClicked_.bind(this);
 
     g_browser.addHttpThrottlingObserver(this);
   }
 
   cr.addSingletonGetter(HttpThrottlingView);
@@ skipping 13 matching lines @@
     /**
      * Handler for the onclick event of the checkbox.
      */
     onEnableCheckboxClicked_: function() {
       g_browser.enableHttpThrottling(this.enableCheckbox_.checked);
     }
   };
 
   return HttpThrottlingView;
 })();