scheme, and use it in the confirmation dialog that asks whether to launch such
links.
bug 258802
windows and cross-platform part: r=ere sr=neil,bz
linux part: r=bz sr=bryner
This adds a new method launchWithFile on nsIMIMEInfo which takes care of opening
the selected (preferred or default) application on the mime info with a
specified document. defaultDescription is now readonly, and defaultApplication
no longer available.
This also removes the clone method which was unused in the entire tree.