Disallow uploading patches to closed issues
Disallow uploading patches to closed issues

BUG=http://code.google.com/p/chromium/issues/detail?id=162012

Author: iannucci@chromium.org

Review: https://codereview.appspot.com/6851091/

riannucci/rietveldv2,riannucci/rietveldv2