Use @Native annotation on dart2js DOM native classes

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

 // Copyright (c) 2012, 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 {
 
 $if DART2JS
   @DomName('Navigator.language')
   String get language => JS('String', '#.language || #.userLanguage', this,
       this);
 $endif
 
   /**
    * Gets a stream (video and or audio) from the local computer.
    *
@@ skipping 68 matching lines @@
     }
   }
 
   @JSName('getUserMedia')
   void _getUserMedia(options, _NavigatorUserMediaSuccessCallback success,
       _NavigatorUserMediaErrorCallback error) native;
 $endif
 
 $!MEMBERS
 }