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

chrome/browser/resources/net_internals/service_providers_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 on Winsock layered service providers and
  * namespace providers.
  *
  * For each layered service provider, shows the name, dll, and type
  * information.  For each namespace provider, shows the name and
  * whether or not it's active.
  */
+var ServiceProvidersView = (function() {
+  'use strict';
 
-var ServiceProvidersView = (function() {
-  const TAB_ID = 'tab-handle-service-providers';
+  var TAB_ID = 'tab-handle-service-providers';
 
   // IDs for special HTML elements in service_providers_view.html
-  const MAIN_BOX_ID = 'service-providers-view-tab-content';
-  const SERVICE_PROVIDERS_TBODY_ID = 'service-providers-view-tbody';
-  const NAMESPACE_PROVIDERS_TBODY_ID =
+  var MAIN_BOX_ID = 'service-providers-view-tab-content';
+  var SERVICE_PROVIDERS_TBODY_ID = 'service-providers-view-tbody';
+  var NAMESPACE_PROVIDERS_TBODY_ID =
       'service-providers-view-namespace-providers-tbody';
 
   // We inherit from DivView.
   var superClass = DivView;
 
   /**
    * @constructor
    */
   function ServiceProvidersView() {
+    assertFirstConstructorCall(ServiceProvidersView);
+
     // Call superclass's constructor.
     superClass.call(this, MAIN_BOX_ID);
 
     var tab = $(TAB_ID);
     setNodeDisplay(tab, true);
 
     this.serviceProvidersTbody_ = $(SERVICE_PROVIDERS_TBODY_ID);
     this.namespaceProvidersTbody_ = $(NAMESPACE_PROVIDERS_TBODY_ID);
 
     g_browser.addServiceProvidersObserver(this);
@@ skipping 117 matching lines @@
   /**
    * Returns protocol type of a layered service provider as a string.
    */
   function getProtocolType(layeredServiceProvider) {
     return tryGetValueWithKey(PROTOCOL_TYPE,
                               layeredServiceProvider.socket_protocol);
   }
 
   return ServiceProvidersView;
 })();