Move builderList creation to ct-failure-card

Another change needed for https://codereview.chromium.org/502293003/

I believe this also fixes a bug I introduced where builderList
was not updated when failures change :(

R=ojan@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/541123002

git-svn-id: svn://svn.chromium.org/blink/trunk@181594 bbb929c8-8fbe-4397-9dbb-9b2b20218538