HandlerCallback: Remove duplicate code
HandlerCallback: Remove duplicate code

Summary: as title

Test Plan: fbmake

Reviewed By: haijunz@fb.com

Subscribers: alandau, bmatheny, mshneer, yfeldblum

FB internal diff: D1892416

Signature: t1:1892416:1425595613:04b2f657a13bc7fa6fa32a94a9ed5b1592f7cbd4

guker/fbthrift,facebook/fbthrift,HankFaan/fbthrift,fengshao0907/fbthrift,project-zerus/fbthrift,maxwell-demon/fbthrift,fengshao0907/fbthrift,SergeyMakarenko/fbthrift,LinusU/fbthrift,chjp2046/fbthrift,facebook/fbthrift,sinjar666/fbthrift,getyourguide/fbthrift,getyourguide/fbthrift,guker/fbthrift,kangkot/fbthrift,kangkot/fbthrift,HankFaan/fbthrift,fengshao0907/fbthrift,kangkot/fbthrift,getyourguide/fbthrift,LinusU/fbthrift,raphaelamorim/fbthrift,project-zerus/fbthrift,soumith/fbthrift,SergeyMakarenko/fbthrift,guker/fbthrift,project-zerus/fbthrift,maxwell-demon/fbthrift,soumith/fbthrift,project-zerus/fbthrift,guker/fbthrift,fengshao0907/fbthrift,guker/fbthrift,facebook/fbthrift,SergeyMakarenko/fbthrift,Orvid/fbthrift,soumith/fbthrift,getyourguide/fbthrift,LinusU/fbthrift,raphaelamorim/fbthrift,kangkot/fbthrift,HankFaan/fbthrift,sinjar666/fbthrift,Orvid/fbthrift,fengshao0907/fbthrift,chjp2046/fbthrift,maxwell-demon/fbthrift,getyourguide/fbthrift,facebook/fbthrift,LinusU/fbthrift,Orvid/fbthrift,soumith/fbthrift,SergeyMakarenko/fbthrift,SergeyMakarenko/fbthrift,LinusU/fbthrift,chjp2046/fbthrift,chjp2046/fbthrift,HankFaan/fbthrift,raphaelamorim/fbthrift,guker/fbthrift,Orvid/fbthrift,raphaelamorim/fbthrift,kangkot/fbthrift,SergeyMakarenko/fbthrift,raphaelamorim/fbthrift,raphaelamorim/fbthrift,HankFaan/fbthrift,SergeyMakarenko/fbthrift,SergeyMakarenko/fbthrift,chjp2046/fbthrift,chjp2046/fbthrift,soumith/fbthrift,LinusU/fbthrift,facebook/fbthrift,chjp2046/fbthrift,fengshao0907/fbthrift,soumith/fbthrift,Orvid/fbthrift,soumith/fbthrift,sinjar666/fbthrift,getyourguide/fbthrift,chjp2046/fbthrift,chjp2046/fbthrift,project-zerus/fbthrift,sinjar666/fbthrift,sinjar666/fbthrift,raphaelamorim/fbthrift,sinjar666/fbthrift,getyourguide/fbthrift,HankFaan/fbthrift,project-zerus/fbthrift,getyourguide/fbthrift,SergeyMakarenko/fbthrift,guker/fbthrift,Orvid/fbthrift,kangkot/fbthrift,project-zerus/fbthrift,fengshao0907/fbthrift,chjp2046/fbthrift,soumith/fbthrift,LinusU/fbthrift,maxwell-demon/fbthrift,raphaelamorim/fbthrift,sinjar666/fbthrift,guker/fbthrift,facebook/fbthrift,SergeyMakarenko/fbthrift,Orvid/fbthrift,getyourguide/fbthrift,raphaelamorim/fbthrift,guker/fbthrift,HankFaan/fbthrift,Orvid/fbthrift,LinusU/fbthrift,maxwell-demon/fbthrift,sinjar666/fbthrift,kangkot/fbthrift,project-zerus/fbthrift,SergeyMakarenko/fbthrift,guker/fbthrift,project-zerus/fbthrift,Orvid/fbthrift,project-zerus/fbthrift,soumith/fbthrift,maxwell-demon/fbthrift,getyourguide/fbthrift,fengshao0907/fbthrift,maxwell-demon/fbthrift,getyourguide/fbthrift,guker/fbthrift,maxwell-demon/fbthrift,maxwell-demon/fbthrift,kangkot/fbthrift,maxwell-demon/fbthrift,kangkot/fbthrift,facebook/fbthrift,kangkot/fbthrift,HankFaan/fbthrift,HankFaan/fbthrift,soumith/fbthrift,sinjar666/fbthrift,Orvid/fbthrift,LinusU/fbthrift,sinjar666/fbthrift,raphaelamorim/fbthrift,HankFaan/fbthrift,project-zerus/fbthrift,fengshao0907/fbthrift,SergeyMakarenko/fbthrift,facebook/fbthrift,fengshao0907/fbthrift,facebook/fbthrift,fengshao0907/fbthrift,Orvid/fbthrift,LinusU/fbthrift,chjp2046/fbthrift,sinjar666/fbthrift,soumith/fbthrift,HankFaan/fbthrift,kangkot/fbthrift,LinusU/fbthrift,raphaelamorim/fbthrift,maxwell-demon/fbthrift,chjp2046/fbthrift,project-zerus/fbthrift,getyourguide/fbthrift