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This releases HANDLE ownership *before* sending any handle in a
message to a remote process, rather than after. Avoids an extremely
subtle race between DuplicateHandle+DUPLICATE_CLOSE_SOURCE in the
receiving process racing with ScopedHandle release in the sending
process. The trade-off is the introduction of potential leaks which
turn out to not really matter in any practical scenarios.

Bug: 900655
Change-Id: Ieec82bb062bc66cdb3c732c920a220ea2aa2f8d0
Reviewed-on: https://chromium-review.googlesource.com/c/1310505
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Joe Mason <joenotcharles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604510}