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If a path is already shared, we can avoid the extra seneschal dbus call.

This code was originally written before GuestOsSharePath::IsPathShared()
was available.

Change-Id: Ia92dcad3e3202f40606a0e8b7620e0ea76847c58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596472
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Jason Lin <lxj@google.com>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Jason Lin <lxj@google.com>
Cr-Commit-Position: refs/heads/master@{#838587}