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As BubbleDialogModelHost::Close() tear-down (removal of model_) is
synchronous, but views isn't. We need to check and see if the model_
has been destroyed when checking for the initially-focused view.

A TODO is left to see if we can prevent GetInitiallyFocusedView() from
being called after Widget::Close() has been called.

Bug: 1106422, 1130181
Change-Id: I8056c3dd242e9ec5ce8fc909a0f558dc7a264dae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425363Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Auto-Submit: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809764}