Refactor SmbProviderClient methods to use default handler

This change adds a default handler in order to reduce code duplication
among similar methods in SmbProviderClient.

Bug: chromium:757625
Change-Id: Iaf01dc185f94fae713ffd5f3ec2494c3f910429f
Reviewed-on: https://chromium-review.googlesource.com/917123
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Allen Vicencio <allenvic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536656}
1 file changed