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Window::GetRootWindow() returns a nullable but there's currently no null
guard nor DCHECK at callsite KeyboardUIController::DeactivateKeyboard().
This is causing some nullptr crash. The crash cannot be repro'd manually
and it's unclear as to why this didn't cause issues earlier.

Bug: 1162338
Change-Id: I40baabcb32aa4d41943af27372c8e2410c2d49f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612587Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Bao-Duy Tran <tranbaoduy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841323}