Update node_validator_test for IE11

tools/dom/src/Validators.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 dart.dom.html;
 
 
 /**
  * Interface used to validate that only accepted elements and attributes are
  * allowed while parsing HTML strings into DOM nodes.
@@ skipping 93 matching lines @@
   final Location _loc = window.location;
 
   bool allowsUri(String uri) {
     _hiddenAnchor.href = uri;
     // IE leaves an empty hostname for same-origin URIs.
     return (_hiddenAnchor.hostname == _loc.hostname &&
         _hiddenAnchor.port == _loc.port &&
         _hiddenAnchor.protocol == _loc.protocol) ||
         (_hiddenAnchor.hostname == '' &&
         _hiddenAnchor.port == '' &&
-        _hiddenAnchor.protocol == ':');
+        (_hiddenAnchor.protocol == ':' || _hiddenAnchor.protocol == ''));
   }
 }
 
 
 class _ThrowsNodeValidator implements NodeValidator {
   final NodeValidator validator;
 
   _ThrowsNodeValidator(this.validator) {}
 
   bool allowsElement(Element element) {
@@ skipping 77 matching lines @@
       case Node.COMMENT_NODE:
       case Node.DOCUMENT_FRAGMENT_NODE:
       case Node.TEXT_NODE:
       case Node.CDATA_SECTION_NODE:
         break;
       default:
         node.remove();
     }
   }
 }