Fix regression introduced by proxy port.
Fix regression introduced by proxy port.

Change-Id: I42a6110d41e79bb0ad50817e2e76b06f7973f6c2

BUG=chromium-os:10434
TEST=Ran it with --test_prefix for delay payload test and it succeeded.

Review URL: http://codereview.chromium.org/5877007

vmware/coreos-scripts,fivethreeo/scripts,mjg59/scripts,bcwaldon/coreos-scripts,trnubo/scripts,sigma/coreos-scripts,nicescale/scripts,mischief/scripts,BugRoger/scripts,smilart/scripts,coreos/scripts,vmware/coreos-scripts,andrejro/coreos--scripts,marineam/coreos-scripts,crawford/scripts,sigma/coreos-scripts,smilart/scripts,gtank/scripts,BugRoger/scripts,trnubo/scripts,crawford/scripts,zhang0137/scripts,andrejro/coreos--scripts,marineam/coreos-scripts,gtank/scripts,bcwaldon/coreos-scripts,marineam/coreos-scripts,glevand/coreos--scripts,endocode/scripts,mjg59/scripts,vmware/coreos-scripts,endocode/scripts,mischief/scripts,BugRoger/scripts,trnubo/scripts,nicescale/scripts,zhang0137/scripts,endocode/scripts,glevand/coreos--scripts,gtank/scripts,fivethreeo/scripts,crawford/scripts,sigma/coreos-scripts,mjg59/scripts,coreos/scripts,fivethreeo/scripts,zhang0137/scripts,smilart/scripts,bcwaldon/coreos-scripts,andrejro/coreos--scripts,mischief/scripts,nicescale/scripts