When we get to Gerrit 3.x the old html theming, hideci.js and
commentlinks that parse html and rely on urls no longer work. Lets clean
that up when we get there.
We can add back in similar things that polygerrit does support later
but we don't want that to make the upgrade even more difficult to do.
This should only be merged once we are running Gerrit 3.x.
Change-Id: I838840e6cbf09ca28faeb2cf06290e298a4a1f74
52094c441d