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

chrome/browser/resources/net_internals/http_cache_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 the HTTP cache.
  */
+var HttpCacheView = (function() {
+  'use strict';
 
-var HttpCacheView = (function() {
   // IDs for special HTML elements in http_cache_view.html
-  const MAIN_BOX_ID = 'http-cache-view-tab-content';
-  const STATS_DIV_ID = 'http-cache-view-cache-stats';
+  var MAIN_BOX_ID = 'http-cache-view-tab-content';
+  var STATS_DIV_ID = 'http-cache-view-cache-stats';
 
   // We inherit from DivView.
   var superClass = DivView;
 
   /**
    *  @constructor
    */
   function HttpCacheView() {
+    assertFirstConstructorCall(HttpCacheView);
+
     // Call superclass's constructor.
     superClass.call(this, MAIN_BOX_ID);
 
     this.statsDiv_ = $(STATS_DIV_ID);
 
     // Register to receive http cache info.
     g_browser.addHttpCacheInfoObserver(this);
   }
 
   cr.addSingletonGetter(HttpCacheView);
@@ skipping 17 matching lines @@
       for (var statName in info.stats) {
         var li = addNode(statsUl, 'li');
         addTextNode(li, statName + ': ' + info.stats[statName]);
       }
       return true;
     }
   };
 
   return HttpCacheView;
 })();