Disable next compatibility mode for ChromeVox on dev channel

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

Index: chrome/renderer/resources/extensions/automation/automation_node.js
diff --git a/chrome/renderer/resources/extensions/automation/automation_node.js b/chrome/renderer/resources/extensions/automation/automation_node.js
index 225c0d2e7c57b185f67eec87ac6bff5fe7cef508..ae62b33316b469eb1bceb9be86e76a8c71ea0cc3 100644
--- a/chrome/renderer/resources/extensions/automation/automation_node.js
+++ b/chrome/renderer/resources/extensions/automation/automation_node.js
@@ -950,6 +950,10 @@ AutomationRootNodeImpl.prototype = {
     return result;
   },
 
+  get chromeChannel() {
+    return GetStringAttribute(this.treeID, this.id, 'chromeChannel');
+  },
+
   get docUrl() {
     return GetDocURL(this.treeID);
   },
@@ -1125,6 +1129,7 @@ function AutomationRootNode() {
 utils.expose(AutomationRootNode, AutomationRootNodeImpl, {
   superclass: AutomationNode,
   readonly: [
+    'chromeChannel',
     'docTitle',
     'docUrl',
     'docLoaded',