Fix typo in sanitizer

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 171 matching lines @@
     // embed tag. The only thing that will let it through is a null
     // sanitizer that doesn't traverse the tree at all. But sanitizing while
     // allowing embeds seems quite unlikely.
     var corrupted = true;
     var attrs;
     var isAttr;
     try {
       // If getting/indexing attributes throws, count that as corrupt.
       attrs = element.attributes;
       isAttr = attrs['is'];
-      corrupted = Element.hasCorruptedAttributes(element);
+      corrupted = Element._hasCorruptedAttributes(element);
     } catch(e) {}
      var elementText = 'element unprintable';
     try {
       elementText = element.toString();
     } catch(e) {}
     var elementTagName = 'element tag unavailable';
     try {
       elementTagName = element.tagName;
     } catch(e) {}
     _sanitizeElement(element, parent, corrupted, elementText, elementTagName,
@@ skipping 55 matching lines @@
       case Node.COMMENT_NODE:
       case Node.DOCUMENT_FRAGMENT_NODE:
       case Node.TEXT_NODE:
       case Node.CDATA_SECTION_NODE:
         break;
       default:
         _removeNode(node, parent);
     }
   }
 }