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

chrome/browser/resources/net_internals/export_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 options for exporting the captured data.
- *  @constructor
  */
 var ExportView = (function() {
+  'use strict';
+
   // IDs for special HTML elements in export_view.html
-  const MAIN_BOX_ID = 'export-view-tab-content';
-  const DOWNLOAD_IFRAME_ID = 'export-view-download-iframe';
-  const SAVE_FILE_BUTTON_ID = 'export-view-save-log-file';
-  const SAVE_STATUS_TEXT_ID = 'export-view-save-status-text';
-  const SECURITY_STRIPPING_CHECKBOX_ID =
+  var MAIN_BOX_ID = 'export-view-tab-content';
+  var DOWNLOAD_IFRAME_ID = 'export-view-download-iframe';
+  var SAVE_FILE_BUTTON_ID = 'export-view-save-log-file';
+  var SAVE_STATUS_TEXT_ID = 'export-view-save-status-text';
+  var SECURITY_STRIPPING_CHECKBOX_ID =
     'export-view-security-stripping-checkbox';
-  const USER_COMMENTS_TEXT_AREA_ID = 'export-view-user-comments';
+  var USER_COMMENTS_TEXT_AREA_ID = 'export-view-user-comments';
 
   // We inherit from DivView.
   var superClass = DivView;
 
+  /**
+   * @constructor
+   */
   function ExportView() {
+    assertFirstConstructorCall(ExportView);
+
     // Call superclass's constructor.
     superClass.call(this, MAIN_BOX_ID);
 
     var securityStrippingCheckbox = $(SECURITY_STRIPPING_CHECKBOX_ID);
     securityStrippingCheckbox.onclick =
         this.onSetSecurityStripping_.bind(this, securityStrippingCheckbox);
 
     this.downloadIframe_ = $(DOWNLOAD_IFRAME_ID);
 
     this.saveFileButton_ = $(SAVE_FILE_BUTTON_ID);
@@ skipping 105 matching lines @@
       blobBuilder.append(dumpText, 'native');
       var textBlob = blobBuilder.getBlob('octet/stream');
       this.lastBlobURL_ = window.webkitURL.createObjectURL(textBlob);
       this.downloadIframe_.src = this.lastBlobURL_;
       this.setSaveFileStatus('Dump successful', false);
     }
   };
 
   return ExportView;
 })();