Fix @ToT Blink group on the flakiness dashboard.

r179509 incorrectly converted the master map. It didn't
include the @ToT Blink group.

TBR since this is causing the flakiness dashboard to be
down for the blink bots.

TBR=szager@chromium.org

Review URL: https://codereview.chromium.org/462963003

git-svn-id: svn://svn.chromium.org/blink/trunk@180019 bbb929c8-8fbe-4397-9dbb-9b2b20218538