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For USER_NOTIF support in the syscall broker, the broker will need to
send two fds to the CLONE_FILES process (temporary IPC socket for reply,
and the newly opened FD). The current BrokerSimpleMessage only supports
sending and receiving a single FD, so this CL adds support for
async-signal-safe sending/receiving of multiple FDs.

Bug: 1117351
Change-Id: I708f200b047857816a9c2958535a360811e25741
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412761Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812478}