EXO: Fix WaylandPointerDelegate Event include

A transitive include was recently broken, include event.h directly to
fix.

Bug: b/133174544
Test: Chromecast build
Change-Id: I60749acb3d930a97d7eec5a58f3ce03094faa6b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628998
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Auto-Submit: Fergus Simpson <afergs@chromium.org>
Commit-Queue: Fergus Simpson <afergs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663285}
1 file changed