Created attachment 145520 [details] [review]
use the new seed import syntax

If you have a seed extension with a signal callback, you get an error like
    ** ERROR **: Error in signal marshal. Unable to convert argument of type:
GdkEvent
when the callback is called.  Then abort() is called.  (Epiphany + Seed from
git, but probably also 2.28.)  For example, the Don't Close Tabs extension at
<http://blogs.gnome.org/racarr/2009/02/08/epiphany-seed-extensions/> causes
ephy to crash when you close the main window---this is an almost-minimal
example.

Working out the problem was a nightmare ;-) but the patch is trivial.  The real
problem is that Epiphany is using a deprecated, now-removed, syntax for seed
imports.