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On Windows, Chrome doesn't generate a synthetic mouse exit event,
see crbug.com/394672.

Change-Id: I1b8ae0e43061f2c555c317cfd1f2f683b79db738
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316843
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793804}