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

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 5dcd6920dfdb4c16745a6fd5bb87e8d77e0c857f..1a471f4c4651c46703d2a9f00176190a3040e47a 100644
--- a/Source/modules/webdatabase/Database.idl
+++ b/Source/modules/webdatabase/Database.idl
@@ -30,8 +30,8 @@
     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);
 };