Removed unused extension method
Removed unused extension method

nausley/commandline,huoxudong125/commandline,Thilas/commandline,nausley/commandline,Emergensys/commandline,anthonylangsworth/commandline,kshanafelt/commandline,Thilas/commandline,anthonylangsworth/commandline,rmboggs/commandline,rmboggs/commandline,kshanafelt/commandline,Emergensys/commandline,huoxudong125/commandline