ungoogled-chromium-xdg-aur/chromium.install

post_upgrade() {
  if (($(vercmp $2 42.0.2311.90-1) < 0)); then
    echo ':: This Chromium package no longer supports custom flags passed via the'
    echo '   /etc/chromium/default file (or any other files under /etc/chromium/).'
    echo
    echo '   The new /usr/bin/chromium launcher script will automatically detect'
    echo '   Pepper Flash (if installed) and pass the correct flags to Chromium.'
    echo
    echo '   If you need to pass extra command-line arguments to Chromium, you'
    echo '   can put them in a "chromium-flags.conf" file under $HOME/.config/'
    echo '   (or $XDG_CONFIG_HOME). Arguments are split on whitespace and shell'
    echo '   quoting rules apply but no further parsing is performed.'
  fi
}

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