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

Source/modules/webdatabase/SQLTransaction.idl

Index: Source/modules/webdatabase/SQLTransaction.idl
diff --git a/Source/modules/webdatabase/SQLTransaction.idl b/Source/modules/webdatabase/SQLTransaction.idl
index 3bb39847b26bd1d7a920d48a61f11f0815e42c74..472e1b9526fc2244254dade8e4ccee1324328a91 100644
--- a/Source/modules/webdatabase/SQLTransaction.idl
+++ b/Source/modules/webdatabase/SQLTransaction.idl
@@ -31,6 +31,7 @@
 ] interface SQLTransaction {
     [Custom] void executeSql(DOMString sqlStatement,
                              ObjectArray arguments,
-                             [Callback] optional SQLStatementCallback callback,
-                             [Callback] optional SQLStatementErrorCallback errorCallback);
+                             optional SQLStatementCallback callback,
+                             optional SQLStatementErrorCallback errorCallback);
+
 };