[Sheriff-o-matic] Refactor cards and get rid of ct-failure-cards

Directly embed the failure cards into the failure stream, and abstract
the button UI out into ct-failure-card-buttons.

NOTRY=true
R=ojan@chromium.org

Review URL: https://codereview.chromium.org/565523002

git-svn-id: svn://svn.chromium.org/blink/trunk@181864 bbb929c8-8fbe-4397-9dbb-9b2b20218538