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We'd like to use CountResidentBytes in child processes to know resident
size of base::SharedMemory, but this function is currently unavailable
in sandboxed processes since this function uses 'mincore' syscall.

This CL changes the sandbox policy to allow mincore everywhere on Linux
and Android.

Bug: 741984
Change-Id: Ie3e595c872e2ec52d2b36660cee0a6710012859a
Reviewed-on: https://chromium-review.googlesource.com/566757
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487390}