Clean up redundant code in GetSDKReferenceFilesTestFixture
Clean up redundant code in GetSDKReferenceFilesTestFixture

jeffkl/msbuild,yazeng/msbuild,zima2219981998/msbuilding,sean-gilliam/msbuild,rainersigwald/msbuild,mono/msbuild,cdmihai/msbuild,ValMenn/msbuild,zima2219981998/msbuilding,Microsoft/msbuild,chipitsine/msbuild,nikson/msbuild,jeffkl/msbuild,cdmihai/msbuild,AndyGerlicher/msbuild,danteinforno/msbuild,mono/msbuild,danteinforno/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,yazeng/msbuild,AndyGerlicher/msbuild,LordJZ/msbuild,rainersigwald/msbuild,cdmihai/msbuild,LordJZ/msbuild,chipitsine/msbuild,mono/msbuild,mono/msbuild,AndyGerlicher/msbuild,nikson/msbuild,jeffkl/msbuild,zima2219981998/msbuilding,ValMenn/msbuild,rainersigwald/msbuild,Microsoft/msbuild,nikson/msbuild,Microsoft/msbuild,ValMenn/msbuild,jeffkl/msbuild,LordJZ/msbuild,cdmihai/msbuild,nikson/msbuild,yazeng/msbuild,danteinforno/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,Microsoft/msbuild,chipitsine/msbuild,chipitsine/msbuild,ValMenn/msbuild,sean-gilliam/msbuild