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        Reviewed by Gustavo Noronha.

        [GTK] Make layout tests / jsc tests usable without build-webkit
        https://bugs.webkit.org/show_bug.cgi?id=21784

        This requires WEBKITOUTPUTDIR to be set to the build directory.
        Set the location of the product dir to the location pointed to by
        WEBKITOUTPUTDIR.

        * Scripts/webkitdirs.pm:

git-svn-id: svn://svn.chromium.org/blink/trunk@42891 bbb929c8-8fbe-4397-9dbb-9b2b20218538