This file is indexed.

postinst is in chromium-browser 34.0.1847.116-0ubuntu2.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] ; then
    update-alternatives --install /usr/bin/x-www-browser \
        x-www-browser /usr/bin/chromium-browser 40
    update-alternatives --install /usr/bin/gnome-www-browser \
        gnome-www-browser /usr/bin/chromium-browser 40
fi

rm -f /etc/default/chromium-browser