flyout: ListMenuFlyoutController should check for window validity This small CL lets `ListMenuFlyoutController` make sure that the window it's trying to remove actually exists instead of its implementer. Bug: 433410990 Change-Id: I063feac04bad8d300019840c1c44dda8625bf5d9 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6939071 Reviewed-by: Sinan Sahin <sinansahin@google.com> Commit-Queue: Masa Fujita <massan@google.com> Cr-Commit-Position: refs/heads/main@{#1516044}
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