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ScopedFileDescriptor was initially introduced to facilitate the
management of a 'lifeline' FD used when asking permission_broker to
open a port in the device's firewall on CrOS.  It's actually a scoped
wrapper around DBus::FileDescriptor, not a platform file descriptor. I
would like to use it to facilitate some other similar functionality in
which I create a pipe and pass one end over DBus, so it seems like a
good idea to move ScopedFileDescriptor into the dbus library directly.

BUG=chromium:481340
TEST=FirewallHole unit tests still pass
STATUS=Fixed
R=keybuk, reillyg, stevenjb

Review URL: https://codereview.chromium.org/1090243003

Cr-Commit-Position: refs/heads/master@{#327089}