exo: Fix motion events client dtor order.

Globals need to be destroyed before the wl_display.

BUG=
TEST=wayland_motion_events --use-drm
TBR=dcastagna@chromium.org

Review-Url: https://codereview.chromium.org/2568703002
Cr-Commit-Position: refs/heads/master@{#437792}

components/exo/wayland/clients/motion_events.cc

@@ -345,8 +345,8 @@ class MotionEvents {
   const base::TimeDelta benchmark_interval_;
   const std::string* use_drm_;
 
-  Globals globals_;
   std::unique_ptr<wl_display> display_;
+  Globals globals_;
 
 #if defined(OZONE_PLATFORM_GBM)
   base::ScopedFD drm_fd_;