Bug 946175 - Make all sandbox variables default to an instance of their class type. r=gps
Bug 946175 - Forbid assigning over a value previously set in moz.build. r=gps
Bug 945042 - Add moz.build infrastructure to replace NO_PROFILE_GUIDED_OPTIMIZE from Makefile.in. r=gps
Bug 945042 - Move NO_PROFILE_GUIDED_OPTIMIZE to moz.build. r=gps,r=njn