Use @Native annotation on dart2js DOM native classes

tools/dom/templates/html/impl/impl_HTMLInputElement.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
+$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS implements
     HiddenInputElement,
     SearchInputElement,
     TextInputElement,
     UrlInputElement,
     TelephoneInputElement,
     EmailInputElement,
     PasswordInputElement,
     DateInputElement,
     MonthInputElement,
     WeekInputElement,
     TimeInputElement,
     LocalDateTimeInputElement,
     NumberInputElement,
     RangeInputElement,
     CheckboxInputElement,
     RadioButtonInputElement,
     FileUploadInputElement,
     SubmitButtonInputElement,
     ImageButtonInputElement,
     ResetButtonInputElement,
-    ButtonInputElement
-    $NATIVESPEC {
+    ButtonInputElement {
 
   factory InputElement({String type}) {
     var e = document.createElement("input");
     if (type != null) {
       try {
         // IE throws an exception for unknown types.
         e.type = type;
       } catch(_) {}
     }
     return e;
@@ skipping 549 matching lines @@
 abstract class ResetButtonInputElement implements InputElementBase {
   factory ResetButtonInputElement() => new InputElement(type: 'reset');
 }
 
 /**
  * A button, with no default behavior.
  */
 abstract class ButtonInputElement implements InputElementBase {
   factory ButtonInputElement() => new InputElement(type: 'button');
 }
-