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

chrome/browser/resources/net_internals/sockets_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 state of all socket pools.
  *
  *   - Shows a summary of the state of each socket pool at the top.
  *   - For each pool with allocated sockets or connect jobs, shows all its
  *     groups with any allocated sockets.
  */
+var SocketsView = (function() {
+  'use strict';
 
-var SocketsView = (function() {
   // IDs for special HTML elements in sockets_view.html
-  const MAIN_BOX_ID = 'sockets-view-tab-content';
-  const SOCKET_POOL_DIV_ID = 'sockets-view-pool-div';
-  const SOCKET_POOL_GROUPS_DIV_ID = 'sockets-view-pool-groups-div';
-  const CLOSE_IDLE_SOCKETS_BUTTON_ID = 'sockets-view-close-idle-button';
-  const SOCKET_POOL_FLUSH_BUTTON_ID = 'sockets-view-flush-button';
+  var MAIN_BOX_ID = 'sockets-view-tab-content';
+  var SOCKET_POOL_DIV_ID = 'sockets-view-pool-div';
+  var SOCKET_POOL_GROUPS_DIV_ID = 'sockets-view-pool-groups-div';
+  var CLOSE_IDLE_SOCKETS_BUTTON_ID = 'sockets-view-close-idle-button';
+  var SOCKET_POOL_FLUSH_BUTTON_ID = 'sockets-view-flush-button';
 
   // We inherit from DivView.
   var superClass = DivView;
 
   /**
    * @constructor
    */
   function SocketsView() {
+    assertFirstConstructorCall(SocketsView);
+
     // Call superclass's constructor.
     superClass.call(this, MAIN_BOX_ID);
 
     g_browser.addSocketPoolInfoObserver(this);
     this.socketPoolDiv_ = $(SOCKET_POOL_DIV_ID);
     this.socketPoolGroupsDiv_ = $(SOCKET_POOL_GROUPS_DIV_ID);
 
     var closeIdleButton = $(CLOSE_IDLE_SOCKETS_BUTTON_ID);
     closeIdleButton.onclick = this.closeIdleSockets.bind(this);
 
@@ skipping 40 matching lines @@
     },
 
     flushSocketPools: function() {
       g_browser.sendFlushSocketPools();
       g_browser.checkForUpdatedInfo(false);
     }
   };
 
   return SocketsView;
 })();