Removed 'using' directive from header.
Removed 'using' directive from header.

Review: https://reviews.apache.org/r/10256

git-svn-id: 03d7800a49d8905ef4fbcc296184319e19243493@1464747 13f79535-47bb-0310-9956-ffa450edef68

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