move gtk dependency to brightray
move gtk dependency to brightray

lakshmi-srinivas/brightray,brave/brightray,tejaspathak/brightray,atom/brightray,lakshmi-srinivas/brightray,hokein/brightray,brave/brightray,paulcbetts/brightray,hokein/brightray,tejaspathak/brightray,deepak1556/brightray,atom/brightray,bbondy/brightray,bbondy/brightray,lakshmi-srinivas/brightray,paulcbetts/brightray,deepak1556/brightray