A few fixes in preloaders
A few fixes in preloaders

Reviewed By: tyao1

Differential Revision: D21751409

fbshipit-source-id: 09dd79a7766f1f0a0eacec1d76430dca86482efa

xuorig/relay,facebook/relay,atxwebs/relay,voideanvalue/relay,josephsavona/relay,facebook/relay,wincent/relay,yungsters/relay,voideanvalue/relay,kassens/relay,kassens/relay,atxwebs/relay,voideanvalue/relay,xuorig/relay,atxwebs/relay,facebook/relay,wincent/relay,facebook/relay,wincent/relay,kassens/relay,wincent/relay,yungsters/relay,josephsavona/relay,wincent/relay,xuorig/relay,yungsters/relay,voideanvalue/relay,xuorig/relay,xuorig/relay,voideanvalue/relay,josephsavona/relay,atxwebs/relay,wincent/relay,kassens/relay,kassens/relay,voideanvalue/relay,facebook/relay,facebook/relay,xuorig/relay,kassens/relay