Use task_scheduler in c/b/chromeos/arc/process/arc_process_service.cc

BUG=chromium:667892
TEST=try, start ARC, press Search+ESC to show the UI

Change-Id: I96b9cefaddbe26dc78edcb5217cae58d3c4a6a81
Reviewed-on: https://chromium-review.googlesource.com/580012
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488569}
1 file changed