Fix printer vendor options handling.

chrome/browser/resources/print_preview/data/ticket_items/vendor_items.js

Index: chrome/browser/resources/print_preview/data/ticket_items/vendor_items.js
diff --git a/chrome/browser/resources/print_preview/data/ticket_items/vendor_items.js b/chrome/browser/resources/print_preview/data/ticket_items/vendor_items.js
index d2acb1f780d2b50ba4ea35fe67f2e49cbbe452fa..d8c6e89d441fc4e9389d916a68413b580fe8fe9d 100644
--- a/chrome/browser/resources/print_preview/data/ticket_items/vendor_items.js
+++ b/chrome/browser/resources/print_preview/data/ticket_items/vendor_items.js
@@ -53,8 +53,8 @@ cr.define('print_preview.ticket_items', function() {
     /** @return {boolean} Whether the ticket item was modified by the user. */
     isUserEdited: function() {
       // If there's at least one ticket item stored in values, it was edited.
-      for (var key in values) {
-        if (values.hasOwnProperty(key))
+      for (var key in this.items_) {
+        if (this.items_.hasOwnProperty(key))
           return true;
       }
       return false;