chrome_cleaner/os unit tests, part 3: s-z

R=csharp

Bug: 830892
Change-Id: I8e4af3d60d35a4b4af24267bb9967bca4ac5b5cc
Reviewed-on: https://chromium-review.googlesource.com/1150808
Commit-Queue: Joe Mason <joenotcharles@chromium.org>
Reviewed-by: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578746}
9 files changed