Fixing broken tests because of mismatch of suppressed warnings.

tools/dom/src/TemplateBindings.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 html;
 
 // 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 593 matching lines @@
   static void _removeAllBindingsRecursively(Node node) {
     _nodeOrCustom(node).unbindAll();
     for (var c = node.$dom_firstChild; c != null; c = c.nextNode) {
       _removeAllBindingsRecursively(c);
     }
   }
 
   static void _removeChild(Node parent, Node child) {
     child._templateInstance = null;
     if (child is Element && (child as Element).isTemplate) {
+      Element childElement = child;
       // Make sure we stop observing when we remove an element.
-      var templateIterator = child._templateIterator;
+      var templateIterator = childElement._templateIterator;
       if (templateIterator != null) {
         templateIterator.abandon();
-        child._templateIterator = null;
+        childElement._templateIterator = null;
       }
     }
     child.remove();
     _removeAllBindingsRecursively(child);
   }
 }
 
 class _BindingToken {
   final String value;
   final bool isBinding;
@@ skipping 150 matching lines @@
     _sub.cancel();
     _sub = null;
   }
 
   void abandon() {
     unobserve();
     _valueBinding.cancel();
     inputs.dispose();
   }
 }