Revert "Converting Polymer and TemplateElement to use deprecated Node.document"

pkg/mdv/lib/src/template_iterator.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of mdv;
 
 // This code is a port of Model-Driven-Views:
 // https://github.com/polymer-project/mdv
 // The code mostly comes from src/template_element.js
 
@@ skipping 318 matching lines @@
   }
 
   void _handleChanges(Iterable<ChangeRecord> splices) {
     if (closed) return;
 
     splices = splices.where((s) => s is ListChangeRecord);
 
     var template = _templateElement;
     var delegate = template.bindingDelegate;
 
-    if (template.parentNode == null || template.document.window == null) {
+    if (template.parentNode == null || template.ownerDocument.window == null) {
       close();
       // TODO(jmesserly): MDV calls templateIteratorTable.delete(this) here,
       // but I think that's a no-op because only nodes are used as keys.
       // See https://github.com/Polymer/mdv/pull/114.
       return;
     }
 
     var instanceCache = new HashMap(equals: identical);
     var removeDelta = 0;
     for (var splice in splices) {
@@ skipping 55 matching lines @@
         nodeExt._templateIterator = null;
       }
     }
 
     _nodeOrCustom(node).unbindAll();
     for (var c = node.firstChild; c != null; c = c.nextNode) {
       _unbindAllRecursively(c);
     }
   }
 }