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

chrome/browser/resources/net_internals/proxy_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 proxy setup:
  *
  *   - Shows the current proxy settings.
  *   - Has a button to reload these settings.
  *   - Shows the log entries for the most recent INIT_PROXY_RESOLVER source
  *   - Shows the list of proxy hostnames that are cached as "bad".
  *   - Has a button to clear the cached bad proxies.
  */
+var ProxyView = (function() {
+  'use strict';
 
-var ProxyView = (function() {
   // IDs for special HTML elements in proxy_view.html
-  const MAIN_BOX_ID = 'proxy-view-tab-content';
-  const ORIGINAL_SETTINGS_DIV_ID = 'proxy-view-original-settings';
-  const EFFECTIVE_SETTINGS_DIV_ID = 'proxy-view-effective-settings';
-  const RELOAD_SETTINGS_BUTTON_ID = 'proxy-view-reload-settings';
-  const BAD_PROXIES_TBODY_ID = 'proxy-view-bad-proxies-tbody';
-  const CLEAR_BAD_PROXIES_BUTTON_ID = 'proxy-view-clear-bad-proxies';
-  const PROXY_RESOLVER_LOG_PRE_ID = 'proxy-view-resolver-log';
+  var MAIN_BOX_ID = 'proxy-view-tab-content';
+  var ORIGINAL_SETTINGS_DIV_ID = 'proxy-view-original-settings';
+  var EFFECTIVE_SETTINGS_DIV_ID = 'proxy-view-effective-settings';
+  var RELOAD_SETTINGS_BUTTON_ID = 'proxy-view-reload-settings';
+  var BAD_PROXIES_TBODY_ID = 'proxy-view-bad-proxies-tbody';
+  var CLEAR_BAD_PROXIES_BUTTON_ID = 'proxy-view-clear-bad-proxies';
+  var PROXY_RESOLVER_LOG_PRE_ID = 'proxy-view-resolver-log';
 
   // We inherit from DivView.
   var superClass = DivView;
 
   /**
    * @constructor
    */
   function ProxyView() {
+    assertFirstConstructorCall(ProxyView);
+
     // Call superclass's constructor.
     superClass.call(this, MAIN_BOX_ID);
 
     this.latestProxySourceId_ = 0;
 
     // Hook up the UI components.
     $(RELOAD_SETTINGS_BUTTON_ID).onclick =
         g_browser.sendReloadProxySettings.bind(g_browser);
     $(CLEAR_BAD_PROXIES_BUTTON_ID).onclick =
         g_browser.sendClearBadProxies.bind(g_browser);
@@ skipping 114 matching lines @@
         this.clearLog_();
     },
 
     onAllSourceEntriesDeleted: function() {
       this.clearLog_();
     }
   };
 
   return ProxyView;
 })();