Revert "Roll IDL to multivm@910"

third_party/WebCore/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 18 matching lines @@
     interface [
         Conditional=FILE_SYSTEM,
         Supplemental=DOMWindow
     ] DOMWindowFileSystem {
         const unsigned short TEMPORARY = 0;
         const unsigned short PERSISTENT = 1;
 
         [V8EnabledAtRuntime=FileSystem] void webkitRequestFileSystem(in unsigned short type, in long long size,
                 in [Callback] FileSystemCallback successCallback, in [Callback, Optional] ErrorCallback errorCallback);
         [V8EnabledAtRuntime=FileSystem] void webkitResolveLocalFileSystemURL(in DOMString url,
-                in [Callback] EntryCallback successCallback, in [Callback, Optional] ErrorCallback errorCallback);
+                in [Callback, Optional] EntryCallback successCallback, in [Callback, Optional] ErrorCallback errorCallback);
     };
 
 }