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Chrome seems to crash when adding a new monitor with the virtual
keyboard enabled. The stack trace suggests the keyboard window is null.
Check for when the keyboard window is null as a speculative fix.

Bug: 1157150
Change-Id: I6475dde46bed1a9c8f5246ace76790e836a312e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585262Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836842}