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

Source/modules/filesystem/Entry.idl

 /*
  * Copyright (C) 2010 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 19 matching lines @@
 
 [
     CustomToJSObject
 ] interface Entry {
     readonly attribute boolean isFile;
     readonly attribute boolean isDirectory;
     readonly attribute DOMString name;
     readonly attribute DOMString fullPath;
     readonly attribute DOMFileSystem filesystem;
 
-    void getMetadata([Callback] MetadataCallback successCallback, [Callback] optional ErrorCallback errorCallback);
-    void moveTo(DirectoryEntry parent, [TreatNullAs=NullString, TreatUndefinedAs=NullString] optional DOMString name, [Callback] optional EntryCallback successCallback, [Callback] optional ErrorCallback errorCallback);
-    void copyTo(DirectoryEntry parent, [TreatNullAs=NullString, TreatUndefinedAs=NullString] optional DOMString name, [Callback] optional EntryCallback successCallback, [Callback] optional ErrorCallback errorCallback);
+    void getMetadata(MetadataCallback successCallback, optional ErrorCallback errorCallback);
+    void moveTo(DirectoryEntry parent, [TreatNullAs=NullString, TreatUndefinedAs=NullString] optional DOMString name, optional EntryCallback successCallback, optional ErrorCallback errorCallback);
+    void copyTo(DirectoryEntry parent, [TreatNullAs=NullString, TreatUndefinedAs=NullString] optional DOMString name, optional EntryCallback successCallback, optional ErrorCallback errorCallback);
     DOMString toURL();
-    void remove([Callback] VoidCallback successCallback, [Callback] optional ErrorCallback errorCallback);
-    void getParent([Callback] optional EntryCallback successCallback, [Callback] optional ErrorCallback errorCallback);
+    void remove(VoidCallback successCallback, optional ErrorCallback errorCallback);
+    void getParent(optional EntryCallback successCallback, optional ErrorCallback errorCallback);
 };