Delete garden-o-matic.

The port to polymer is (basically) complete. Sheriff-o-matic
is replacing garden-o-matic.

Only functional change in this patch is to sort the scripts
and imports in ct-sheriff-o-matic.html. The rest of the patch
is just deleting unused files.

There's more code to delete with unused functions in some of
the remaining files, but that can be done in a followup.

NOTRY=true

Review URL: https://codereview.chromium.org/405843002

git-svn-id: svn://svn.chromium.org/blink/trunk@178526 bbb929c8-8fbe-4397-9dbb-9b2b20218538