IDL: [NoImplHeader] should not add '#include "None"'

Source/bindings/tests/idls/core/TestInterface3.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 // This is for interface extended attributes that interact with another extended
 // attribute, and thus both cannot be tested at once; and for special
 // operations, which need a separate interface to test on.
 // The more *minor* extended attribute should be put in this file.
 
 [
     Custom=VisitDOMWrapper, // Conflict with [SetWrapperReferenceTo] and [SetWrapperReferenceFrom]
+    NoImplHeader,
 ] interface TestInterface3 {
     [Custom] getter boolean (unsigned long index);
     [Custom] setter boolean (unsigned long index, Node value);
     [Custom] deleter boolean (unsigned long index);
 
     [Custom=(PropertyGetter,PropertyEnumerator,PropertyQuery)] getter Node (DOMString name);
     [Custom] setter Node (DOMString name, Node value);
     [Custom] deleter boolean (DOMString name);
 };