Revert "Use @Native annotation on dart2js DOM native classes"

tools/dom/templates/html/impl/impl_EventTarget.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;
 
 /**
  * Base class that supports listening for and dispatching browser events.
  *
  * Normally events are accessed via the Stream getter:
@@ skipping 72 matching lines @@
     return new _ElementEventStreamImpl(_ptr, type, false);
   }
 }
 
 /**
  * Base class for all browser objects that support events.
  *
  * Use the [on] property to add, and remove events
  * for compile-time type checks and a more concise API.
  */
-$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
+$(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
   // Custom element created callback.
   EventTarget._created();
 
   /**
    * This is an ease-of-use accessor for event streams which should only be
    * used when an explicit accessor is not available.
    */
   Events get on => new Events(this);
 $!MEMBERS
 }