Don't crash if the cookie pipe doesn't exist. Review URL: http://chromereview.prom.corp.google.com/1187035
Don't crash if the cookie pipe doesn't exist.
Review URL: http://chromereview.prom.corp.google.com/1187035

git-svn-id: 59a3318ba88c04536d83f47c63c52b7f675c4a1a@233 06c00378-0e64-4dae-be16-12b19f9950a1

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