All Chrome OS builds should be using Ozone now. In build targets that are only built for Chrome OS, any code that is guarded by #ifdef USE_X11 or any files that are only included if GN use_x11==true can be deleted.
Similarly, any code that is guarded by #ifdef USE_OZONE probably doesn't need the include guard anymore.
There is lots of related code cleanup where parts of interfaces that only applied to X11 can be deleted too, for example in NativeDisplayDelegate.
Comment 1 by kylec...@chromium.org
, Jul 31 2017