Expose getRequestKey_UNSTABLE on relay-runtime
Expose getRequestKey_UNSTABLE on relay-runtime

Reviewed By: kassens

Differential Revision: D9691403

fbshipit-source-id: e08451d37f5226947b01aa3654dba1de78a7ee51

facebook/relay,facebook/relay,dbslone/relay,xuorig/relay,cpojer/relay,xuorig/relay,freiksenet/relay,voideanvalue/relay,voideanvalue/relay,kassens/relay,atxwebs/relay,iamchenxin/relay,voideanvalue/relay,facebook/relay,atxwebs/relay,wincent/relay,kassens/relay,josephsavona/relay,wincent/relay,zpao/relay,yungsters/relay,cpojer/relay,kassens/relay,xuorig/relay,wincent/relay,voideanvalue/relay,wincent/relay,facebook/relay,facebook/relay,yungsters/relay,wincent/relay,zpao/relay,facebook/relay,josephsavona/relay,kassens/relay,josephsavona/relay,voideanvalue/relay,wincent/relay,xuorig/relay,freiksenet/relay,freiksenet/relay,atxwebs/relay,xuorig/relay,kassens/relay,kassens/relay,voideanvalue/relay,iamchenxin/relay,dbslone/relay,iamchenxin/relay,atxwebs/relay,iamchenxin/relay,zpao/relay,cpojer/relay,yungsters/relay,xuorig/relay,cpojer/relay