Fix build by removing unused import.
Fix build by removing unused import.

mettekou/ghc,ezyang/ghc,olsner/ghc,vikraman/ghc,vTurbine/ghc,mettekou/ghc,snoyberg/ghc,shlevy/ghc,sdiehl/ghc,ezyang/ghc,olsner/ghc,olsner/ghc,olsner/ghc,snoyberg/ghc,mettekou/ghc,ezyang/ghc,sdiehl/ghc,mettekou/ghc,sdiehl/ghc,vTurbine/ghc,vikraman/ghc,vikraman/ghc,vTurbine/ghc,vikraman/ghc,shlevy/ghc,ezyang/ghc,ezyang/ghc,ezyang/ghc,snoyberg/ghc,vikraman/ghc,mettekou/ghc,vTurbine/ghc,sgillespie/ghc,vTurbine/ghc,olsner/ghc,shlevy/ghc,sgillespie/ghc,ezyang/ghc,shlevy/ghc,sgillespie/ghc,sdiehl/ghc,vTurbine/ghc,sgillespie/ghc,snoyberg/ghc,mettekou/ghc,snoyberg/ghc,olsner/ghc,sdiehl/ghc,shlevy/ghc,sdiehl/ghc,snoyberg/ghc,snoyberg/ghc,shlevy/ghc,vTurbine/ghc,vikraman/ghc,shlevy/ghc,sgillespie/ghc,vikraman/ghc,sgillespie/ghc,mettekou/ghc,sdiehl/ghc,olsner/ghc,sgillespie/ghc