Revert "appendHtml, when sanitizing, should create document fragment in the right context"

tools/dom/templates/html/impl/impl_Element.darttemplate

 // Copyright (c) 2012, 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 $LIBRARYNAME;
 
 class _ChildrenElementList extends ListBase<Element>
     implements NodeListWrapper {
   // Raw Element.
   final Element _element;
@@ skipping 999 matching lines @@
    * See also:
    *
    * * [insertAdjacentText]
    * * [insertAdjacentElement]
    */
   void insertAdjacentHtml(String where, String html, {NodeValidator validator,
       NodeTreeSanitizer treeSanitizer}) {
       if (treeSanitizer is _TrustedHtmlTreeSanitizer) {
         _insertAdjacentHtml(where, html);
       } else {
-        _insertAdjacentNode(where, createFragment(html,
+        _insertAdjacentNode(where, new DocumentFragment.html(html,
             validator: validator, treeSanitizer: treeSanitizer));
       }
   }
 
 $if DART2JS
 
   @JSName('insertAdjacentHTML')
   void _insertAdjacentHtml(String where, String text) native;
 
   /**
@@ skipping 551 matching lines @@
   const ScrollAlignment._internal(this._value);
   toString() => 'ScrollAlignment.$_value';
 
   /// Attempt to align the element to the top of the scrollable area.
   static const TOP = const ScrollAlignment._internal('TOP');
   /// Attempt to center the element in the scrollable area.
   static const CENTER = const ScrollAlignment._internal('CENTER');
   /// Attempt to align the element to the bottom of the scrollable area.
   static const BOTTOM = const ScrollAlignment._internal('BOTTOM');
 }