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This change implements Remount on SmbProviderClient which calls Remount
on the SmbProvider Daemon via D-Bus.

Bug: 757625
Change-Id: I11b419863996e6bba685f14136e54d65db007d0a
Reviewed-on: https://chromium-review.googlesource.com/987199
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548165}