Replace ct-failure-analyzer with a model.

This change removes the ct-failure-analyzer UI element and replaces it with a
CTFailures model object. Hopefully this is what was intended-- I left most of
the methods on the CTFailures object intact and didn't change much of how it
was interacted with.

I manually tested this comparing the pages on the current sheriff-o-matic
and a locally hosted one and it looked the same. "make test" also passes
all tests.

NOTRY=true
BUG=400394

Review URL: https://codereview.chromium.org/513993002

git-svn-id: svn://svn.chromium.org/blink/trunk@181043 bbb929c8-8fbe-4397-9dbb-9b2b20218538