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This is implemented in terms of an |is_closed_| state, which prevents
reentrancy during shutdown.

Bug: 1045247
Change-Id: I69e8bd095979f6571fbe95b298f91166b61dc9f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363998
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800282}