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Prior to macOS 10.15, an inherited, open, writable FD could not be
ftruncate()d without an explicit sandbox rule. This verifies that
behavior and will catch any regressions in the future.

Bug: 1084565
Change-Id: I9b3d6b0f3b8e9cb1a02f975b33e16501482f23f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451315Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814336}