Sheriff-o-matic: SSL all the things.

Loading Sheriff-o-matic over HTTPS _should_ work, but doesn't, because
the application loads data over insecure connections (and opens up
insecure iframes). This patch moves to HTTPS by default.

BUG=417257
NOTRY=true

Review URL: https://codereview.chromium.org/603613002

git-svn-id: svn://svn.chromium.org/blink/trunk@182672 bbb929c8-8fbe-4397-9dbb-9b2b20218538