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

Source/modules/filesystem/WorkerContextFileSystem.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
@@ skipping 10 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 WorkerContext {
     const unsigned short TEMPORARY = 0;
     const unsigned short PERSISTENT = 1;
 
-    [EnabledAtRuntime=FileSystem] void webkitRequestFileSystem(unsigned short type, long long size, [Callback] optional FileSystemCallback successCallback, [Callback] optional ErrorCallback errorCallback);
+    [EnabledAtRuntime=FileSystem] void webkitRequestFileSystem(unsigned short type, long long size, optional FileSystemCallback successCallback, optional ErrorCallback errorCallback);
     [EnabledAtRuntime=FileSystem, RaisesException] DOMFileSystemSync webkitRequestFileSystemSync(unsigned short type, long long size);
-    [EnabledAtRuntime=FileSystem] void webkitResolveLocalFileSystemURL(DOMString url, [Callback] EntryCallback successCallback, [Callback] optional ErrorCallback errorCallback);
+    [EnabledAtRuntime=FileSystem] void webkitResolveLocalFileSystemURL(DOMString url, EntryCallback successCallback, optional ErrorCallback errorCallback);
     [EnabledAtRuntime=FileSystem, RaisesException] EntrySync webkitResolveLocalFileSystemSyncURL(DOMString url);
 
     [EnabledAtRuntime=FileSystem] attribute FileErrorConstructor FileError;
     [EnabledAtRuntime=FileSystem] attribute FileExceptionConstructor FileException;
 };