Revert "Dartium JS Interop enabled."

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

 // Copyright (c) 2011, 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;
 
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
   factory $CLASSNAME() => document.createDocumentFragment();
 
   factory $CLASSNAME.html(String html,
@@ skipping 20 matching lines @@
 $endif
   List<Element> _docChildren;
 
   List<Element> get children {
     if (_docChildren == null) {
       _docChildren = new FilteredElementList(this);
     }
     return _docChildren;
   }
 
-  set children(List<Element> value) {
+  void set children(List<Element> value) {
     // Copy list first since we don't want liveness during iteration.
     List copy = new List.from(value);
     var children = this.children;
     children.clear();
     children.addAll(copy);
   }
 
   /**
    * Finds all descendant elements of this document fragment that match the
    * specified group of selectors.
    *
    * [selectors] should be a string using CSS selector syntax.
    *
    *     var items = document.querySelectorAll('.itemClassName');
    *
    * For details about CSS selector syntax, see the
    * [CSS selector specification](http://www.w3.org/TR/css3-selectors/).
    */
   ElementList<Element> querySelectorAll(String selectors) =>
+$if JSINTEROP
+    _querySelectorAll(selectors);
+$else
     new _FrozenElementList._wrap(_querySelectorAll(selectors));
+$endif
+
 
   String get innerHtml {
     final e = new Element.tag("div");
     e.append(this.clone(true));
     return e.innerHtml;
   }
 
-  set innerHtml(String value) {
+  void set innerHtml(String value) {
     this.setInnerHtml(value);
   }
 
   void setInnerHtml(String html,
     {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
 
     this.nodes.clear();
     append(document.body.createFragment(
         html, validator: validator, treeSanitizer: treeSanitizer));
   }
@@ skipping 33 matching lines @@
    * semantics will be changing in the future.
    */
   @deprecated
   @Experimental()
   @DomName('DocumentFragment.querySelectorAll')
   ElementList<Element> queryAll(String relativeSelectors) {
     return querySelectorAll(relativeSelectors);
   }
 $!MEMBERS
 }