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Clean up aria-setsize-posinset.html Layout Test to use testharness
and be more human-readable. Larger goal is to more thoroughly test
the aria-posinset and aria-setSize attributes, especially in
ambiguous cases.

Change-Id: I950d45ceda2bbeb3fb10423812a13380b0da3ef4
Reviewed-on: https://chromium-review.googlesource.com/c/1332412Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607851}