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Also changes the sandboxed file system version of these tests to run in
both windows and workers.

The native file system version of these tests are currently manual tests.
In the future we can automate them. Also currently some of the writer
tests don't pass in the native file system version, because of things like
bug 998913.

Bug: 998917
Change-Id: I4aefee6e35008afd73c2cf316d16ea189717bd4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787869Reviewed-by: Olivier Yiptong <oyiptong@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699539}