Removed DARTIUM codegen for IDLS (sdk/lib/dartium)

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,
       {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
 
     return document.body.createFragment(html,
       validator: validator, treeSanitizer: treeSanitizer);
   }
 
   factory $CLASSNAME.svg(String svgContent,
       {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
 
     return new svg.SvgSvgElement().createFragment(svgContent,
         validator: validator, treeSanitizer: treeSanitizer);
   }
 
   HtmlCollection get _children => throw new UnimplementedError(
       'Use _docChildren instead');
 
-$if DART2JS
   // Native field is used only by Dart code so does not lead to instantiation
   // of native classes
   @Creates('Null')
-$endif
   List<Element> _docChildren;
 
   List<Element> get children {
     if (_docChildren == null) {
       _docChildren = new FilteredElementList(this);
     }
     return _docChildren;
   }
 
   set children(List<Element> value) {
@@ skipping 71 matching lines @@
    * Alias for [querySelectorAll]. Note this function is deprecated because its
    * semantics will be changing in the future.
    */
   @deprecated
   @Experimental()
   @DomName('DocumentFragment.querySelectorAll')
   ElementList<Element /*=T*/> queryAll/*<T extends Element>*/(String relativeSelectors) =>
     querySelectorAll(relativeSelectors);
 $!MEMBERS
 }