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

chrome/browser/resources/net_internals/dns_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 host resolver:
  *
  *   - Shows the default address family.
  *   - Has a button to enable IPv6, if it is disabled.
  *   - Shows the current host cache contents.
  *   - Has a button to clear the host cache.
  *   - Shows the parameters used to construct the host cache (capacity, ttl).
  */
 
 var DnsView = (function() {
+  'use strict';
+
   // IDs for special HTML elements in dns_view.html
-  const MAIN_BOX_ID = 'dns-view-tab-content';
-  const CACHE_TBODY_ID = 'dns-view-cache-tbody';
-  const CLEAR_CACHE_BUTTON_ID = 'dns-view-clear-cache';
-  const DEFAULT_FAMILY_SPAN_ID = 'dns-view-default-family';
-  const IPV6_DISABLED_SPAN_ID = 'dns-view-ipv6-disabled';
-  const ENABLE_IPV6_BUTTON_ID = 'dns-view-enable-ipv6';
-  const CAPACITY_SPAN_ID = 'dns-view-cache-capacity';
-  const TTL_SUCCESS_SPAN_ID = 'dns-view-cache-ttl-success';
-  const TTL_FAILURE_SPAN_ID = 'dns-view-cache-ttl-failure';
+  var MAIN_BOX_ID = 'dns-view-tab-content';
+  var CACHE_TBODY_ID = 'dns-view-cache-tbody';
+  var CLEAR_CACHE_BUTTON_ID = 'dns-view-clear-cache';
+  var DEFAULT_FAMILY_SPAN_ID = 'dns-view-default-family';
+  var IPV6_DISABLED_SPAN_ID = 'dns-view-ipv6-disabled';
+  var ENABLE_IPV6_BUTTON_ID = 'dns-view-enable-ipv6';
+  var CAPACITY_SPAN_ID = 'dns-view-cache-capacity';
+  var TTL_SUCCESS_SPAN_ID = 'dns-view-cache-ttl-success';
+  var TTL_FAILURE_SPAN_ID = 'dns-view-cache-ttl-failure';
 
   // We inherit from DivView.
   var superClass = DivView;
 
   /**
    *  @constructor
    */
   function DnsView() {
+    assertFirstConstructorCall(DnsView);
+
     // Call superclass's constructor.
     superClass.call(this, MAIN_BOX_ID);
 
     $(ENABLE_IPV6_BUTTON_ID).onclick = g_browser.enableIPv6.bind(g_browser);
     $(CLEAR_CACHE_BUTTON_ID).onclick =
         g_browser.sendClearHostResolverCache.bind(g_browser);
 
     // Register to receive changes to the host resolver info.
     g_browser.addHostResolverInfoObserver(this);
   }
@@ skipping 62 matching lines @@
         var expiresCell = addNode(tr, 'td');
         addTextNode(expiresCell, expiresDate.toLocaleString());
       }
 
       return true;
     }
   };
 
   return DnsView;
 })();