Remove per-call ContextCallback delegate allocation
Remove per-call ContextCallback delegate allocation

Pass the 'this' reference via the state object rather than via the delegate.

shahid-pk/corefx,dhoehna/corefx,Priya91/corefx-1,krk/corefx,tijoytom/corefx,dhoehna/corefx,khdang/corefx,alexperovich/corefx,ericstj/corefx,stone-li/corefx,fgreinacher/corefx,lggomez/corefx,stone-li/corefx,fgreinacher/corefx,benpye/corefx,marksmeltzer/corefx,ptoonen/corefx,janhenke/corefx,alexperovich/corefx,shmao/corefx,richlander/corefx,janhenke/corefx,mmitche/corefx,the-dwyer/corefx,jhendrixMSFT/corefx,krk/corefx,manu-silicon/corefx,Ermiar/corefx,wtgodbe/corefx,shahid-pk/corefx,Chrisboh/corefx,Petermarcu/corefx,dotnet-bot/corefx,ViktorHofer/corefx,marksmeltzer/corefx,zhenlan/corefx,ellismg/corefx,stone-li/corefx,ravimeda/corefx,lggomez/corefx,josguil/corefx,dsplaisted/corefx,adamralph/corefx,tijoytom/corefx,mazong1123/corefx,billwert/corefx,krytarowski/corefx,twsouthwick/corefx,gkhanna79/corefx,JosephTremoulet/corefx,lggomez/corefx,tstringer/corefx,Jiayili1/corefx,SGuyGe/corefx,ellismg/corefx,richlander/corefx,khdang/corefx,zhenlan/corefx,iamjasonp/corefx,JosephTremoulet/corefx,rahku/corefx,gkhanna79/corefx,rjxby/corefx,cydhaselton/corefx,tijoytom/corefx,mazong1123/corefx,benpye/corefx,weltkante/corefx,jhendrixMSFT/corefx,richlander/corefx,DnlHarvey/corefx,lggomez/corefx,yizhang82/corefx,alphonsekurian/corefx,billwert/corefx,rahku/corefx,janhenke/corefx,mazong1123/corefx,krytarowski/corefx,adamralph/corefx,seanshpark/corefx,mafiya69/corefx,krytarowski/corefx,BrennanConroy/corefx,SGuyGe/corefx,kkurni/corefx,marksmeltzer/corefx,stephenmichaelf/corefx,shmao/corefx,pallavit/corefx,mokchhya/corefx,wtgodbe/corefx,alphonsekurian/corefx,axelheer/corefx,jcme/corefx,BrennanConroy/corefx,mafiya69/corefx,josguil/corefx,manu-silicon/corefx,nchikanov/corefx,stephenmichaelf/corefx,benjamin-bader/corefx,nchikanov/corefx,jlin177/corefx,tijoytom/corefx,axelheer/corefx,twsouthwick/corefx,stone-li/corefx,shahid-pk/corefx,gkhanna79/corefx,tijoytom/corefx,shahid-pk/corefx,shmao/corefx,gkhanna79/corefx,benjamin-bader/corefx,rahku/corefx,mellinoe/corefx,ellismg/corefx,billwert/corefx,twsouthwick/corefx,krk/corefx,mokchhya/corefx,mmitche/corefx,alexperovich/corefx,manu-silicon/corefx,the-dwyer/corefx,seanshpark/corefx,dhoehna/corefx,elijah6/corefx,benjamin-bader/corefx,krk/corefx,cydhaselton/corefx,manu-silicon/corefx,shimingsg/corefx,Chrisboh/corefx,the-dwyer/corefx,mellinoe/corefx,Ermiar/corefx,Priya91/corefx-1,MaggieTsang/corefx,DnlHarvey/corefx,jlin177/corefx,YoupHulsebos/corefx,axelheer/corefx,jhendrixMSFT/corefx,shmao/corefx,yizhang82/corefx,rubo/corefx,mazong1123/corefx,pallavit/corefx,ravimeda/corefx,jhendrixMSFT/corefx,Chrisboh/corefx,rjxby/corefx,Jiayili1/corefx,MaggieTsang/corefx,nchikanov/corefx,ravimeda/corefx,nbarbettini/corefx,mafiya69/corefx,marksmeltzer/corefx,iamjasonp/corefx,the-dwyer/corefx,stephenmichaelf/corefx,benjamin-bader/corefx,rjxby/corefx,nbarbettini/corefx,jlin177/corefx,seanshpark/corefx,cydhaselton/corefx,Ermiar/corefx,ellismg/corefx,jcme/corefx,ericstj/corefx,Petermarcu/corefx,Petermarcu/corefx,pallavit/corefx,jlin177/corefx,ericstj/corefx,iamjasonp/corefx,Jiayili1/corefx,josguil/corefx,weltkante/corefx,dotnet-bot/corefx,nbarbettini/corefx,weltkante/corefx,MaggieTsang/corefx,cartermp/corefx,Ermiar/corefx,Priya91/corefx-1,wtgodbe/corefx,ptoonen/corefx,manu-silicon/corefx,DnlHarvey/corefx,mmitche/corefx,mellinoe/corefx,tstringer/corefx,iamjasonp/corefx,dotnet-bot/corefx,ptoonen/corefx,ViktorHofer/corefx,lggomez/corefx,iamjasonp/corefx,seanshpark/corefx,ellismg/corefx,Ermiar/corefx,rahku/corefx,mafiya69/corefx,JosephTremoulet/corefx,ViktorHofer/corefx,weltkante/corefx,nbarbettini/corefx,mellinoe/corefx,janhenke/corefx,seanshpark/corefx,twsouthwick/corefx,rubo/corefx,ravimeda/corefx,axelheer/corefx,cydhaselton/corefx,the-dwyer/corefx,stephenmichaelf/corefx,benpye/corefx,ellismg/corefx,rahku/corefx,cartermp/corefx,ptoonen/corefx,rjxby/corefx,alexperovich/corefx,richlander/corefx,marksmeltzer/corefx,richlander/corefx,alphonsekurian/corefx,axelheer/corefx,rubo/corefx,ericstj/corefx,DnlHarvey/corefx,adamralph/corefx,billwert/corefx,Petermarcu/corefx,ericstj/corefx,mazong1123/corefx,parjong/corefx,yizhang82/corefx,yizhang82/corefx,BrennanConroy/corefx,elijah6/corefx,josguil/corefx,jlin177/corefx,alphonsekurian/corefx,tijoytom/corefx,nbarbettini/corefx,shmao/corefx,shmao/corefx,rjxby/corefx,rahku/corefx,cydhaselton/corefx,nchikanov/corefx,krytarowski/corefx,ericstj/corefx,wtgodbe/corefx,janhenke/corefx,Chrisboh/corefx,jhendrixMSFT/corefx,parjong/corefx,twsouthwick/corefx,shahid-pk/corefx,ptoonen/corefx,benpye/corefx,stone-li/corefx,zhenlan/corefx,nchikanov/corefx,MaggieTsang/corefx,mafiya69/corefx,benjamin-bader/corefx,nbarbettini/corefx,shimingsg/corefx,tijoytom/corefx,YoupHulsebos/corefx,pallavit/corefx,fgreinacher/corefx,benpye/corefx,khdang/corefx,mokchhya/corefx,Chrisboh/corefx,Priya91/corefx-1,shimingsg/corefx,SGuyGe/corefx,khdang/corefx,parjong/corefx,Ermiar/corefx,mellinoe/corefx,shmao/corefx,MaggieTsang/corefx,dotnet-bot/corefx,yizhang82/corefx,dhoehna/corefx,khdang/corefx,kkurni/corefx,mmitche/corefx,ravimeda/corefx,dotnet-bot/corefx,stone-li/corefx,tstringer/corefx,rjxby/corefx,wtgodbe/corefx,krk/corefx,stone-li/corefx,Priya91/corefx-1,khdang/corefx,mmitche/corefx,Jiayili1/corefx,YoupHulsebos/corefx,rahku/corefx,elijah6/corefx,jhendrixMSFT/corefx,benpye/corefx,alphonsekurian/corefx,Jiayili1/corefx,billwert/corefx,lggomez/corefx,richlander/corefx,dsplaisted/corefx,mmitche/corefx,mazong1123/corefx,shahid-pk/corefx,mokchhya/corefx,cartermp/corefx,marksmeltzer/corefx,josguil/corefx,marksmeltzer/corefx,ViktorHofer/corefx,manu-silicon/corefx,wtgodbe/corefx,YoupHulsebos/corefx,parjong/corefx,kkurni/corefx,krk/corefx,Petermarcu/corefx,shimingsg/corefx,zhenlan/corefx,krytarowski/corefx,rubo/corefx,krytarowski/corefx,dhoehna/corefx,krk/corefx,ptoonen/corefx,gkhanna79/corefx,ViktorHofer/corefx,jhendrixMSFT/corefx,gkhanna79/corefx,alexperovich/corefx,elijah6/corefx,jcme/corefx,ViktorHofer/corefx,the-dwyer/corefx,ravimeda/corefx,billwert/corefx,lggomez/corefx,ptoonen/corefx,ericstj/corefx,zhenlan/corefx,dhoehna/corefx,YoupHulsebos/corefx,parjong/corefx,Priya91/corefx-1,cydhaselton/corefx,cartermp/corefx,ravimeda/corefx,mellinoe/corefx,alphonsekurian/corefx,krytarowski/corefx,DnlHarvey/corefx,mmitche/corefx,janhenke/corefx,mokchhya/corefx,seanshpark/corefx,fgreinacher/corefx,rubo/corefx,weltkante/corefx,twsouthwick/corefx,JosephTremoulet/corefx,stephenmichaelf/corefx,benjamin-bader/corefx,MaggieTsang/corefx,elijah6/corefx,jlin177/corefx,JosephTremoulet/corefx,alexperovich/corefx,alexperovich/corefx,manu-silicon/corefx,iamjasonp/corefx,Petermarcu/corefx,josguil/corefx,Jiayili1/corefx,shimingsg/corefx,dhoehna/corefx,tstringer/corefx,zhenlan/corefx,richlander/corefx,seanshpark/corefx,axelheer/corefx,zhenlan/corefx,parjong/corefx,Ermiar/corefx,SGuyGe/corefx,mazong1123/corefx,nchikanov/corefx,kkurni/corefx,elijah6/corefx,stephenmichaelf/corefx,stephenmichaelf/corefx,cartermp/corefx,tstringer/corefx,the-dwyer/corefx,ViktorHofer/corefx,tstringer/corefx,YoupHulsebos/corefx,kkurni/corefx,alphonsekurian/corefx,weltkante/corefx,jcme/corefx,weltkante/corefx,iamjasonp/corefx,kkurni/corefx,JosephTremoulet/corefx,cydhaselton/corefx,Chrisboh/corefx,YoupHulsebos/corefx,Petermarcu/corefx,JosephTremoulet/corefx,SGuyGe/corefx,billwert/corefx,dsplaisted/corefx,nchikanov/corefx,nbarbettini/corefx,pallavit/corefx,SGuyGe/corefx,dotnet-bot/corefx,pallavit/corefx,mokchhya/corefx,elijah6/corefx,DnlHarvey/corefx,parjong/corefx,jcme/corefx,shimingsg/corefx,yizhang82/corefx,gkhanna79/corefx,DnlHarvey/corefx,yizhang82/corefx,cartermp/corefx,rjxby/corefx,twsouthwick/corefx,dotnet-bot/corefx,mafiya69/corefx,jcme/corefx,MaggieTsang/corefx,Jiayili1/corefx,wtgodbe/corefx,shimingsg/corefx,jlin177/corefx