Fix printer vendor options handling.

chrome/browser/resources/print_preview/data/ticket_items/vendor_items.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.
 
 cr.define('print_preview.ticket_items', function() {
   'use strict';
 
   /**
    * An object that represents a user modifiable item in a print ticket. Each
    * ticket item has a value which can be set by the user. Ticket items can also
@@ skipping 35 matching lines @@
     __proto__: cr.EventTarget.prototype,
 
     /** @return {boolean} Whether vendor capabilities are available. */
     isCapabilityAvailable: function() {
       return !!this.capability;
     },
 
     /** @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;
     },
 
     /** @return {Object} Media size capability of the selected destination. */
     get capability() {
       var destination = this.destinationStore_ ?
           this.destinationStore_.selectedDestination : null;
       return (destination &&
@@ skipping 31 matching lines @@
             print_preview.AppState.Field.VENDOR_OPTIONS, this.items_);
       }
     }
   };
 
   // Export
   return {
     VendorItems: VendorItems
   };
 });