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CollectedCookiesViews::CreateAndShowForWebContents may be called
while an existing dialog (widget) is in the process of closing. In
this case, exit gracefully instead of crashing.

The only way I can think of that might be possible to repro this
IRL (i.e. aside from clusterfuzz) would be to:
a) open page info bubble
b) click "cookies"
c) open page info bubble again
d) click "cookies", then focus cookies dialog, press escape,
   all in rapid succession
e) cookies dialog starts closing
f) click on "cookies" is a posted task, and is handled after
   cookies dialog starts closing, but before finishing closing

This is probably exceedingly rare, enough so that it's not worth
being concerned with re-opening the cookies dialog. (And arguably,
it shouldn't re-open anyway, since the last command the user issued
was "escape" (close).)

Bug: 989888
Change-Id: Ic4e3274128f5530b621d9dfe4e99dd6d24bddc21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731914Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683396}