Chrome and Chromium used to have a setting in preferences to let the user specify the preferred protocol, but people allegedly thought that SSL 3.0 was a higher version than TLS 1.0 and would mistakenly disable the latter (source: ImperialViolet).
So, until a Google Chrome or Chromium browser with SSLv3 disabled by default is announced, it is necessary to run Chrome/Chromium with a command line flag: