[css-syntax] Switch to Bikeshed's new railroad-diagram-generating functionality.

--HG--
extra : rebase_source : 2b7af7b75b6d00c0f074719e755637cdccd19792
[css-syntax] Remove lingering file.

--HG--
extra : rebase_source : a985c56381f61a97c6eeff3bd1a8f53efb271d27