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While menu is being shown, it is preventing Chrome from exiting.
However, if a menu is opening while Chrome is already shutting
down, this currently causes a CHECK failure (see linked bug).

The CL is adding shutdown detection logic to ChromeViewsDelegate
and avoids showing a menu if a shutdown is detected. Note that
no callbacks (such as OnMenuClosed) are called.

Bug: 960925
Test: none
Change-Id: Ie282f353b94a5c79a29ba5f770808d552d8e2980
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601419
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659304}