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The fuzzer uses the shared memory API to create a file descriptor
(Harness::GetFileDescriptor). This change updates that creation from
the legacy shared memory API to the new one. There is no functional
change.

Bug: 795291
Change-Id: I186fc316c15c19fea08b04b76d8c663cdb673eb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1695410Reviewed-by: Nic Hollingum <hollingum@google.com>
Commit-Queue: Matthew Cary (CET) <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676303}