need ports help for bug 206379

ok, here's your heads up that I'm going to need some ports work so that 
I can land http://bugzilla.mozilla.org/show_bug.cgi?id=206379. I've done 
the work on mac, windows, and unix and it is pretty straight forward.

I've just asked for reviews, and I plan to land as soon as those reviews 
are finished... so if you're working on one of the non-Unix ports, you 
need to attach a patch to the bug before the reviews are complete!

This bug involves totally revamping the nsICharsetConverterManager 
interface to actually be sane, but in doing the work I've found some 
platform-specific code in widget/, gfx/, and intl/ that needs some help. 
It shouldn't take more than 20 minutes or so on each platform.

you just have to apply the patch, and start your build - when things 
break, you need to look at what the new API does. the conversions for 
the big 3 platforms are really straight forward.

in particular, see this comment:
http://bugzilla.mozilla.org/show_bug.cgi?id=206379#c5

for details on what the patch does.

And of course, I could use reviewers - the patch is big and could use 
lots of eyes.

Alec