DEPS.xwalk: Roll ozone-wayland (8f3a1b5 -> 6379cd1).

* 6379cd1 Move XKB handling to BrowserProcess.
* f45c410 DisplayPollThread: Handle EpollCreation calls during construction phase.
* 5430cf4 Initialize CursorData before Sandbox is enabled.

BUG=XWALK-2789