[Tails-dev] [review'n'merge:1.4.1] feature/9649-tor-browser-…

Hi,

this branch updates Tor Browser to 4.5.3 (-build2, hopefully the
final one). It passes a great part of our test suite, details on
the ticket.

Alan, bertagaz: any taker?

Note that I'll have to merge this one too before building the 1.4.1
ISO anyway.

Cheers,
--
intrigeri