Fix cpplint warning for obj-c header.
Fix cpplint warning for obj-c header.

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