Use @Native annotation on dart2js DOM native classes

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

 // 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 $LIBRARYNAME;
 
-$(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
   @DomName('IDBIndex.count')
   Future<int> count([key_OR_range]) {
    try {
       var request = _count(key_OR_range);
       return _completeRequest(request);
     } catch (e, stacktrace) {
       return new Future.error(e, stacktrace);
     }
   }
 
@@ skipping 68 matching lines @@
     if (direction == null) {
       request = _openKeyCursor(key_OR_range);
     } else {
       request = _openKeyCursor(key_OR_range, direction);
     }
     return ObjectStore._cursorStreamFromResult(request, autoAdvance);
   }
 
   $!MEMBERS
 }