Remove obsolete test case, since we have move Rails::LogSubscriber to ActiveSupport::LogSubscriber in [6788db824ab732b13493a9d702dd8fb89fa153c8] [#4816 state:resolved]
Remove obsolete test case, since we have move Rails::LogSubscriber to ActiveSupport::LogSubscriber in [6788db824ab732b13493a9d702dd8fb89fa153c8] [#4816 state:resolved]

Signed-off-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@gmail.com>

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