Clear out Chrome history from command line?
The Google Chrome history files live in ~/Library/Application Support/Google/Chrome/Default. If you really, really want to delete browsing history from the command line (why?), I think removing the history files in this directory with a command line command/script would be the only way to go like this guy is doing. , as Google Chrome does not provide any ready-made commands or command switches for deleting history according to this list.

However, please consider this excerpt from the README-file: 


  Google Chrome settings and storage represent user-selected
  preferences and information and MUST not be extracted, overwritten or
  modified except through Google Chrome defined APIs.


So, do it at your own risk. I would experiment with deleting the history files of a test installation of Google Chrome and see what happens.