Update FlakyTests now that we handle multiple bots properly.

(They are at least included, though we make no attempt to merge lines).

TBR=abarth@chromium.org

Review URL: https://codereview.chromium.org/398163002

git-svn-id: svn://svn.chromium.org/blink/trunk@178291 bbb929c8-8fbe-4397-9dbb-9b2b20218538