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This change updates a couple of characteristic same object tests to use
the new test API. This will allow the tests to be migrated into the wpt/
directory.

BUG=509038

Change-Id: I483a623c8f58848fb0a7e3cea7cb65b27c79eccc
Reviewed-on: https://chromium-review.googlesource.com/823072
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Conley Owens <cco3@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532060}