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In the future, undead RenderWidgets will no logner exist. This CL updates
RenderViewImpl::CloseWindowSoon to check for this condition.

Bug: 912193
Change-Id: Icbe449794080d36368eac5c9ffe90a198709dbda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814673
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698502}