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This change adds a GetWindowsUNCString method to the SmbUrl class so that
Windows style UNC can be displayed rather than the smb:// style URL.

Bug: chromium:889289
Change-Id: If7f9d3235a7cd38ac854d6bd186ea4af257de6be
Reviewed-on: https://chromium-review.googlesource.com/c/1256107Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596330}