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

Source/modules/webdatabase/Database.idl

Index: Source/modules/webdatabase/Database.idl
diff --git a/Source/modules/webdatabase/Database.idl b/Source/modules/webdatabase/Database.idl
index 4148569d92e290f886f5105cbeb5529176ac6315..1b516c0aff68ecf33fbba7dcef3609ef760727af 100644
--- a/Source/modules/webdatabase/Database.idl
+++ b/Source/modules/webdatabase/Database.idl
@@ -29,8 +29,8 @@
 [
 ] interface Database {
     readonly attribute DOMString version;
-    void changeVersion(DOMString oldVersion, DOMString newVersion, [Callback] optional SQLTransactionCallback callback, [Callback] optional SQLTransactionErrorCallback errorCallback, [Callback] optional VoidCallback successCallback);
-    void transaction([Callback] SQLTransactionCallback callback, [Callback] optional SQLTransactionErrorCallback errorCallback, [Callback] optional VoidCallback successCallback);
-    void readTransaction([Callback] SQLTransactionCallback callback, [Callback] optional SQLTransactionErrorCallback errorCallback, [Callback] optional VoidCallback successCallback);
+    void changeVersion(DOMString oldVersion, DOMString newVersion, optional SQLTransactionCallback callback, optional SQLTransactionErrorCallback errorCallback, optional VoidCallback successCallback);
+    void transaction(SQLTransactionCallback callback, optional SQLTransactionErrorCallback errorCallback, optional VoidCallback successCallback);
+    void readTransaction(SQLTransactionCallback callback, optional SQLTransactionErrorCallback errorCallback, optional VoidCallback successCallback);
 };