caskroom/homebrew-cask — pull request #7691 by dwihn0r (2014-11-29 21:21:25+00:00)
Title: Re-add the FreeSMUG Chromium build (latest version: 38.0.2125.122) as a ...

...separate cask, which has also been adjusted to carry the new format

The Chromium cask has been switching between the latest official build and the FreeSMUG counterpart. It's reasonable that the official builds are in the Chromium cask and third party builds are separated.