Remove the update button from sheriff-o-matic

This CL removes the update button from sheriff-o-matic. We now automatically
update the view. If you want to update faster, you can reload the page now that
it's fast.

Also, I've cleaned up a bunch of CSS related to the top bar.  We'll likely want
to iterate on this look a bit. I've also removed a bunch of tabs.

R=ojan@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/397153004

git-svn-id: svn://svn.chromium.org/blink/trunk@178299 bbb929c8-8fbe-4397-9dbb-9b2b20218538