They are currently in the v8/custom directory which is for *custom bindings*. The events code is infrastructure for supporting the bindings and should be in the bindings/v8 directory. Of course, V8CustomEventListener.* should remain in the custom directory.
Created attachment 28586 [details] Proposed fix.
Comment on attachment 28586 [details] Proposed fix. easy-peasy.
Committed in r41678.