Use @Native annotation on dart2js DOM native classes

tools/dom/templates/html/impl/impl_IDBDatabase.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;
 
 @DocsEditable()
-$(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
   @DomName('IDBDatabase.createObjectStore')
   @DocsEditable()
   ObjectStore createObjectStore(String name,
       {String keyPath, bool autoIncrement}) {
     var options = {};
     if (keyPath != null) {
       options['keyPath'] = keyPath;
     }
     if (autoIncrement != null) {
       options['autoIncrement'] = autoIncrement;
@@ skipping 40 matching lines @@
       throw new ArgumentError(mode);
     }
     return _transaction(storeNames, mode);
   }
 
   @JSName('transaction')
   Transaction _transaction(stores, mode) native;
 $endif
 
 $!MEMBERS}