Simplify import createHashHistory
Simplify import createHashHistory

Summary: Closes https://github.com/facebook/relay/pull/517

Reviewed By: kassens

Differential Revision: D2585190

fb-gh-sync-id: 47dc8906b4b74d2399fec954ed14ea50050e4de1

heracek/relay,yungsters/relay,iamchenxin/relay,kassens/relay,cpojer/relay,facebook/relay,venepe/relay,voideanvalue/relay,NevilleS/relay,atxwebs/relay,venepe/relay,andimarek/generic-relay,voideanvalue/relay,xuorig/relay,wincent/relay,wincent/relay,facebook/relay,Aweary/relay,zpao/relay,forter/generic-relay,xuorig/relay,gabelevi/relay,wincent/relay,benjaminogles/relay,atxwebs/relay,apalm/relay,mroch/relay,yungsters/relay,facebook/relay,xuorig/relay,cpojer/relay,zpao/relay,voideanvalue/relay,xuorig/relay,NevilleS/relay,apalm/relay,freiksenet/relay,voideanvalue/relay,voideanvalue/relay,benjaminogles/relay,yungsters/relay,cesarandreu/relay,kassens/relay,iamchenxin/relay,heracek/relay,dbslone/relay,cesarandreu/relay,cpojer/relay,josephsavona/relay,mroch/relay,josephsavona/relay,rosskevin/relay,dbslone/relay,kassens/relay,voideanvalue/relay,freiksenet/relay,Aweary/relay,andimarek/generic-relay,freiksenet/relay,kassens/relay,venepe/relay,Aweary/relay,chentsulin/relay,benjaminogles/relay,kassens/relay,heracek/relay,iamchenxin/relay,cesarandreu/relay,michaelchum/relay,atxwebs/relay,michaelchum/relay,chirag04/relay,NevilleS/relay,andimarek/generic-relay,facebook/relay,rosskevin/relay,apalm/relay,wincent/relay,wincent/relay,josephsavona/relay,kassens/relay,iamchenxin/relay,gabelevi/relay,chentsulin/relay,mroch/relay,chirag04/relay,chirag04/relay,cpojer/relay,xuorig/relay,facebook/relay,gabelevi/relay,zpao/relay,michaelchum/relay,facebook/relay,xuorig/relay,chentsulin/relay,wincent/relay,atxwebs/relay