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        Reviewed by Adam Barth.

        fix regressions introduced in 81908 - there were a couple of
        code paths that only fired under python 2.5 that I missed.

        Also change a couple of 'python' references to sys.executable
        in order to handle runing test-webkitpy with a binary other than
        something called 'python'.

        https://bugs.webkit.org/show_bug.cgi?id=57063

        * Scripts/webkitpy/layout_tests/port/mac.py:
        * Scripts/webkitpy/layout_tests/port/port_testcase.py:
        * Scripts/webkitpy/test/cat.py:
        * Scripts/webkitpy/test/echo.py:

git-svn-id: svn://svn.chromium.org/blink/trunk@81918 bbb929c8-8fbe-4397-9dbb-9b2b20218538