Magnifier DBus interface vs GSettings

There is a mismatch between some of the magnifier's GSettings and the 
magnifier DBus interface.

An example is enabling and disabling the magnifier.  It's currently 
possible to do this through GSettings, and via the DBus setActive() 
method.  This can lead to an inconsistency if the GSetting is set to 
"off" and the DBus method is used to enable the magnifier.  In that 
case, the magnifier will be active, but shown as off in the GNOME 
Control Center.

There are a number of ways to fix this.  My preference is to delete the 
DBus method.  That is, having a magnifier active/inactive is a user 
preference, and the way to handle that is to make the appropriate 
settings call.

I would similarly remove the DBus method for adjusting magnification 
factor since, again, GSettings provides the support for modifying 
magnification factor.  In fact, the Common Magnifier Framework proposal 
had mag factor supported only by GSettings 
(http://live.gnome.org/Accessibility/MagnificationFramework).

However, before I make these changes to GS-mag's DBus implementation, I 
wanted to make sure that no one depends on their existence.

Any objections?

Note:  the relevant bugzilla is:
https://bugzilla.gnome.org/show_bug.cgi?id=669192

Thanks.

-- 
;;;;joseph.


'A: After all, it isn't rocket science.'
'K: Right. It's merely computer science.'
              - J. D. Klaun -