path/filepath: simplify TestToNorm
path/filepath: simplify TestToNorm

Change-Id: I8a176ed9c7f59ebdfd39c1e2b88905f977179982
Reviewed-on: https://go-review.googlesource.com/31119
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

CAFxX/go,golang/go,momchil-velikov/go,akutz/go,josharian/go,nawawi/go,nawawi/go,derekmarcotte/go,polyverse-security/go,CAFxX/go,ImJasonH/go,derekmarcotte/go,ImJasonH/go,momchil-velikov/go,suncycheng/go,CAFxX/go,linux-on-ibm-z/go,codestation/go,polyverse-security/go,ImJasonH/go,CAFxX/go,Cofyc/go,golang/go,Cofyc/go,derekmarcotte/go,linux-on-ibm-z/go,ImJasonH/go,Cofyc/go,polyverse-security/go,vsekhar/elastic-go,CAFxX/go,momchil-velikov/go,CAFxX/go,linux-on-ibm-z/go,derekmarcotte/go,golang/go,akutz/go,golang/go,nawawi/go,josharian/go,golang/go,vsekhar/elastic-go,goodlang/good,cloudflare/go,ImJasonH/go,CAFxX/go,josharian/go,golang/go,akutz/go,goodlang/good,Cofyc/go,akutz/go,derekmarcotte/go,linux-on-ibm-z/go,linux-on-ibm-z/go,suncycheng/go,derekmarcotte/go,goodlang/good,akutz/go,akutz/go,linux-on-ibm-z/go,vsekhar/elastic-go,vsekhar/elastic-go,codestation/go,suncycheng/go,momchil-velikov/go,codestation/go,Cofyc/go,polyverse-security/go,codestation/go,vsekhar/elastic-go,derekmarcotte/go,nawawi/go,ImJasonH/go,goodlang/good,codestation/go,cloudflare/go,momchil-velikov/go,nawawi/go,suncycheng/go,CAFxX/go,derekmarcotte/go,golang/go,akutz/go,goodlang/good,josharian/go,vsekhar/elastic-go,nawawi/go,codestation/go,suncycheng/go,ImJasonH/go,goodlang/good,Cofyc/go,josharian/go,cloudflare/go,Cofyc/go,golang/go,linux-on-ibm-z/go,nawawi/go,cloudflare/go,momchil-velikov/go,cloudflare/go,suncycheng/go,polyverse-security/go,suncycheng/go,goodlang/good,vsekhar/elastic-go,akutz/go,polyverse-security/go,momchil-velikov/go,momchil-velikov/go,josharian/go,nawawi/go,vsekhar/elastic-go,cloudflare/go,polyverse-security/go,Cofyc/go,codestation/go,codestation/go,cloudflare/go,josharian/go,christopher-henderson/Go,ImJasonH/go,josharian/go,suncycheng/go,polyverse-security/go,cloudflare/go,goodlang/good,linux-on-ibm-z/go