Get rid of [Callback] extended attribute for parameters in IDL files

Source/modules/webdatabase/WorkerContextWebDatabase.idl

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 partial interface WorkerContext {
-    [EnabledAtRuntime=database, RaisesException] Database openDatabase(DOMString name, DOMString version, DOMString displayName, unsigned long estimatedSize, [Callback] optional DatabaseCallback creationCallback);
+    [EnabledAtRuntime=database, RaisesException] Database openDatabase(DOMString name, DOMString version, DOMString displayName, unsigned long estimatedSize, optional DatabaseCallback creationCallback);
 
-    [EnabledAtRuntime=database, RaisesException] DatabaseSync openDatabaseSync(DOMString name, DOMString version, DOMString displayName, unsigned long estimatedSize, [Callback] optional DatabaseCallback creationCallback);
+    [EnabledAtRuntime=database, RaisesException] DatabaseSync openDatabaseSync(DOMString name, DOMString version, DOMString displayName, unsigned long estimatedSize, optional DatabaseCallback creationCallback);
 };