Fix crash when receiving a RequestMove IPC from lingering Keyboard UI reference

Bug: 768164
Change-Id: I020d1f38af6c31d4929505ea47e692ad6d86da5b
Reviewed-on: https://chromium-review.googlesource.com/680250
Commit-Queue: Blake O'Hare <blakeo@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504005}
2 files changed