ozone: Protect X11-specific code under ash

ash/accelerators/accelerator_dispatcher_linux.cc

Index: ash/accelerators/accelerator_dispatcher_linux.cc
diff --git a/ash/accelerators/accelerator_dispatcher_linux.cc b/ash/accelerators/accelerator_dispatcher_linux.cc
index f129b645b908410e607cb76b9bdc72eac49d6874..130b6034c41856d4ebf2aaa8a78728377cfde0a4 100644
--- a/ash/accelerators/accelerator_dispatcher_linux.cc
+++ b/ash/accelerators/accelerator_dispatcher_linux.cc
@@ -64,7 +64,11 @@ class AcceleratorDispatcherLinux : public AcceleratorDispatcher,
     if (IsKeyEvent(event)) {
       ui::KeyEvent key_event(event, false);
       if (MenuClosedForPossibleAccelerator(key_event)) {
+#if defined(USE_X11)
         XPutBackEvent(event->xany.display, event);
+#else
+        NOTIMPLEMENTED();
+#endif
         return ui::POST_DISPATCH_QUIT_LOOP;
       }