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This change wraps the FD-based protected buffers in a
base::subtle::PlatformSharedMemoryRegion rather than the legacy
SharedMemoryHandle. Aside from a couple of new validation checks,
functionality is unchanged.

Bug: 849207

Change-Id: I2df619dc58c6313393e41eef7e4807edf340875e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1697183
Commit-Queue: Matthew Cary (CET) <mattcary@chromium.org>
Reviewed-by: Matthew Cary (CET) <mattcary@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686169}