Remove private xpc APIs
Remove private xpc APIs

bbondy/libchromiumcontent,brave/libchromiumcontent,atom/libchromiumcontent,electron/libchromiumcontent,paulcbetts/libchromiumcontent,electron/libchromiumcontent,paulcbetts/libchromiumcontent,bbondy/libchromiumcontent,brave/libchromiumcontent,atom/libchromiumcontent