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Since there is no way to make read-only file descriptors from Linux
memfd-based regions, the security guarantees of GetReadOnlyHandle()
cannot be maintained with this implementation.

Remove it to fall-back on traditional Posix shared regions instead.

Bug: 792117, 736452
Change-Id: Ie5eb41fc3c4dd02ebdbb77be8375363ba51f1b00
Reviewed-on: https://chromium-review.googlesource.com/809014Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: David Turner <digit@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521768}