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(but still close it when closing them all)

Not sure if this could ever be hit IRL (testcase would check-fail on file
being invalid in File::Read off ReadSparseRange), but I am going to be
touching this for FD limits, and it helps if the code makes sense.

Bug: 636400
Change-Id: Ie33f1787a81f90b893d963e1fcb1db3b4fd0aab2
Reviewed-on: https://chromium-review.googlesource.com/652965
Commit-Queue: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506899}