smbprovider: Add libpasswordprovider dependency

BUG=chromium:757625
TEST=emerges

Change-Id: Icdc58baa75494600ba63cad6c2aff601714d5267
Reviewed-on: https://chromium-review.googlesource.com/993709
Commit-Ready: Allen Vicencio <allenvic@chromium.org>
Tested-by: Allen Vicencio <allenvic@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
1 file changed