Use @Native annotation on dart2js DOM native classes

tools/dom/templates/html/impl/impl_DirectoryEntry.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 {
 
   /**
    * Create a new directory with the specified `path`. If `exclusive` is true,
    * the returned Future will complete with an error if a directory already
    * exists with the specified `path`.
    */
   Future<Entry> createDirectory(String path, {bool exclusive: false}) {
     return _getDirectory(path, options:
         {'create': true, 'exclusive': exclusive});
   }
@@ skipping 19 matching lines @@
   /**
    * Retrieve an already existing file entry. The returned future will
    * result in an error if a file at `path` does not exist or if the item at
    * `path` is not a file.
    */
   Future<Entry> getFile(String path) {
     return _getFile(path);
   }
 $!MEMBERS
 }
-