Removed unnecessary heap allocation for future inside HttpProxy.
Removed unnecessary heap allocation for future inside HttpProxy.

Review: https://reviews.apache.org/r/40226

dforsyth/mesos,yuquanshan/customizedMesos,neilconway/mesos,Aman-Jain-14/customizedMesos,asamerh4/mesos,andschwa/mesos,verizonlabs/mesos,reneploetz/mesos,kaysoky/mesos,andschwa/mesos,verizonlabs/mesos,chhsia0/mesos,kaysoky/mesos,chhsia0/mesos,neilconway/mesos,verizonlabs/mesos,kaysoky/mesos,abudnik/mesos,craimbert/mesos,craimbert/mesos,abudnik/mesos,asamerh4/mesos,dforsyth/mesos,gsantovena/mesos,Gilbert88/mesos,yuquanshan/customizedMesos,kaysoky/mesos,gsantovena/mesos,gsantovena/mesos,reneploetz/mesos,Gilbert88/mesos,jpeach/mesos,andschwa/mesos,yuquanshan/customizedMesos,jpeach/mesos,Gilbert88/mesos,neilconway/mesos,neilconway/mesos,jpeach/mesos,kaysoky/mesos,Gilbert88/mesos,chhsia0/mesos,andschwa/mesos,jpeach/mesos,yuquanshan/customizedMesos,jpeach/mesos,abudnik/mesos,gsantovena/mesos,dforsyth/mesos,craimbert/mesos,reneploetz/mesos,neilconway/mesos,andschwa/mesos,abudnik/mesos,reneploetz/mesos,Gilbert88/mesos,yuquanshan/customizedMesos,zmalik/mesos,chhsia0/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,gsantovena/mesos,craimbert/mesos,reneploetz/mesos,neilconway/mesos,neilconway/mesos,dforsyth/mesos,verizonlabs/mesos,chhsia0/mesos,gsantovena/mesos,kaysoky/mesos,abudnik/mesos,dforsyth/mesos,asamerh4/mesos,kaysoky/mesos,jpeach/mesos,abudnik/mesos,chhsia0/mesos,craimbert/mesos,jpeach/mesos,gsantovena/mesos,asamerh4/mesos,Aman-Jain-14/customizedMesos,Gilbert88/mesos,zmalik/mesos,andschwa/mesos,abudnik/mesos,Aman-Jain-14/customizedMesos,asamerh4/mesos,asamerh4/mesos,reneploetz/mesos,zmalik/mesos,craimbert/mesos,zmalik/mesos,chhsia0/mesos,verizonlabs/mesos,reneploetz/mesos,dforsyth/mesos,andschwa/mesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,dforsyth/mesos,zmalik/mesos,asamerh4/mesos,verizonlabs/mesos,zmalik/mesos,Aman-Jain-14/customizedMesos,verizonlabs/mesos,craimbert/mesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,zmalik/mesos