bug#22671: 25.0.90; EWW: Redirects go to Firefox (rather than EWW)

[raman]

Sometimes, sites send a redirect  with content-type text/html  but that
text/html still gets handed to Firefox -- rather than EWW.
One possible reason is that /etc/mailcap on ubuntu/trusty has this line:
text/html; firefox -private-window %s; test=test -n "$DISPLAY"

It has that for the other xml/html related mime types as well.

Would be nice to let eww handle those redirects if the original was
opened in EWW.

Sample URL to demonstrate the issue: (bird calls )
 http://www.xeno-canto.org/303470/download



In GNU Emacs 25.0.90.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2016-02-04 built on raman-glaptop2
Repository revision: 28074f026207fd146c25745603bfd4ef5eb365da
Windowing system distributor 'The X.Org Foundation', version 11.0.11701000
System Description:     Ubuntu 14.04 LTS

Configured using:
 'configure --enable-silent-rules --with-x-toolkit=gtk3 --with-xwidgets
 --with-modules --without-compress-install'

Configured features:
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