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

Source/modules/filesystem/WorkerContextFileSystem.idl

Index: Source/modules/filesystem/WorkerContextFileSystem.idl
diff --git a/Source/modules/filesystem/WorkerContextFileSystem.idl b/Source/modules/filesystem/WorkerContextFileSystem.idl
index b2966cd6202d9326471305a2375c2f9782527951..744681c042c4183878bac20f32afec0a514f7566 100644
--- a/Source/modules/filesystem/WorkerContextFileSystem.idl
+++ b/Source/modules/filesystem/WorkerContextFileSystem.idl
@@ -28,9 +28,9 @@ 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;