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There are no more users of this implementation, and the new shared
memory APIs do not support FD-backed shared memory on Mac.

Bug: 776564
Change-Id: I9307a6e46daa4329f0d04e6951b6e432a79c2c47
Reviewed-on: https://chromium-review.googlesource.com/c/1303873Reviewed-by: Alexandr Ilin <alexilin@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603757}