htmlTag was missing from the list of stringAttributes for an automationNode

chrome/renderer/resources/extensions/automation/automation_node.js

 // Copyright 2014 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.
 
 var AutomationEvent = require('automationEvent').AutomationEvent;
 var automationInternal =
     require('binding').Binding.create('automationInternal').generate();
 var exceptionHandler = require('uncaught_exception_handler');
 var IsInteractPermitted =
     requireNative('automationInternal').IsInteractPermitted;
@@ skipping 686 matching lines @@
   }
 };
 
 var stringAttributes = [
     'accessKey',
     'ariaInvalidValue',
     'containerLiveRelevant',
     'containerLiveStatus',
     'description',
     'display',
+    'htmlTag',
     'imageDataUrl',
     'language',
     'liveRelevant',
     'liveStatus',
     'name',
     'placeholder',
     'textInputType',
     'url',
     'value'];
 
@@ skipping 448 matching lines @@
 utils.defineProperty(AutomationRootNode, 'getOrCreate', function(treeID) {
   return AutomationRootNodeImpl.getOrCreate(treeID);
 });
 
 utils.defineProperty(AutomationRootNode, 'destroy', function(treeID) {
   AutomationRootNodeImpl.destroy(treeID);
 });
 
 exports.$set('AutomationNode', AutomationNode);
 exports.$set('AutomationRootNode', AutomationRootNode);