The sheriff-o-matic feed changed field names.

TBR to get sheriff-o-matic loading again. The revision numbers
show the latest revision processed by every bot as NaN still,
but this gets the rest of the alerts loading.

TBR=leviw@chromium.org

Review URL: https://codereview.chromium.org/481963003

git-svn-id: svn://svn.chromium.org/blink/trunk@180490 bbb929c8-8fbe-4397-9dbb-9b2b20218538