Decouple FileSystem and WebSQL callbacks from VoidCallback and it non-refcounted

Source/modules/webdatabase/Database.idl

 /*
  * Copyright (C) 2007 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
@@ skipping 12 matching lines @@
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY 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.
  */
 
 [
     NoInterfaceObject
 ] interface Database {
     readonly attribute DOMString version;
-    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);
+    void changeVersion(DOMString oldVersion, DOMString newVersion, optional SQLTransactionCallback callback, optional SQLTransactionErrorCallback errorCallback, optional SQLVoidCallback successCallback);
+    void transaction(SQLTransactionCallback callback, optional SQLTransactionErrorCallback errorCallback, optional SQLVoidCallback successCallback);
+    void readTransaction(SQLTransactionCallback callback, optional SQLTransactionErrorCallback errorCallback, optional SQLVoidCallback successCallback);
 };