Build fix.

        * Modules/webdatabase/DatabaseBackend.cpp: (DoneCreatingDatabaseOnExitCaller):
        Don't fail because of an unused member variable in cross-plaform code path.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141654 268f45cc-cd09-0410-ab3c-d52691b4dbfc