Fix crash in AcceptRoutingHandler due to bad variant get
Fix crash in AcceptRoutingHandler due to bad variant get

Summary: D2435696 missed updating this.

Reviewed By: djwatson

Differential Revision: D2452307

fb-gh-sync-id: 26d15dc049c9728f3149f29acb94800683deae16

facebook/wangle,Dalzhim/wangle,facebook/wangle,Dalzhim/wangle,jamperry/wangle,facebook/wangle,jamperry/wangle