How to rollback Google's new style sign-in to old style on Chromium.

Google's new style sign-in has no option to disable keeping sign-in. Also it always remember my username when I sign out.
So I want to rollback it to old-style.

Just block Javascript on https://accounts.google.com and http://accounts.google.com.

At least it works temporarily.

Reference
http://archive.is/DRXfO (Joseph Corporon's solution)