Fix UserManagerBrowserTest

chrome/browser/resources/md_user_manager/import_supervised_user.js

Index: chrome/browser/resources/md_user_manager/import_supervised_user.js
diff --git a/chrome/browser/resources/md_user_manager/import_supervised_user.js b/chrome/browser/resources/md_user_manager/import_supervised_user.js
index f50131d2c0da815aada7b53c5cddc1758e8039a3..a820afa77e2ff2b96581cf3c49c45ea5dd958a45 100644
--- a/chrome/browser/resources/md_user_manager/import_supervised_user.js
+++ b/chrome/browser/resources/md_user_manager/import_supervised_user.js
@@ -78,6 +78,9 @@ Polymer({
     if (this.signedInUser_)
       this.popupHidden_ = false;
 
+    if (this.popupHidden_)
+      return;
+
     this.async(function() {
       this.$$('paper-listbox').focus();
     }.bind(this));