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

Source/modules/filesystem/DOMWindowFileSystem.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 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:
  * 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
@@ skipping 11 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 partial interface DOMWindow {
     const unsigned short TEMPORARY = 0;
     const unsigned short PERSISTENT = 1;
 
     [EnabledAtRuntime=FileSystem] void webkitRequestFileSystem(unsigned short type, long long size,
-            [Callback] FileSystemCallback successCallback, [Callback] optional ErrorCallback errorCallback);
+            FileSystemCallback successCallback, optional ErrorCallback errorCallback);
     [EnabledAtRuntime=FileSystem] void webkitResolveLocalFileSystemURL(DOMString url,
-            [Callback] EntryCallback successCallback, [Callback] optional ErrorCallback errorCallback);
+            EntryCallback successCallback, optional ErrorCallback errorCallback);
 };