[Pkg-chromium-maint] Bug#851692: chromium: startup script is disabling all extensions

[Paride Legovini]

Package: chromium
Version: 55.0.2883.75-5
Followup-For: Bug #851692

I really thought this was just a coarse bug, but it seems this is not
the case. The new behavior is going to break a lot of setups.

In my opinion the right thing to do is to ask the user during the dpkg
configuration process, leaving the remote extensions enabled by default
(installation and upgrade).

Paride