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A recent bug fix caused another problem with re-entry (or lack of
re-entry) where the connections_ list was no longer updated during force
close, causing uaf issues when that list was iterated later.

R=pwnall@chromium.org

Bug: 966557
Change-Id: I3d5ed163b030c1da8a6515d32108e86868be75b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1632287
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Auto-Submit: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663987}