Wallpaper bustage fix for fallout from bug 839445
Bug 837493 Add about:privatebrowsing page r=IanN,Ratty
Bug 837496 Add -private command line option r=Ratty pending-r=mcsmurf
Bug 837510 Add File - New - Private Window menuitem r=IanN,Ratty
Bug 841230 Add Open Link in Private Window context menuitem r=Ratty pending-r=IanN
Bug 841616 Open Location should have Private Window option r=IanN,Ratty