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Apart from making it more human neck friendly, those which were in
vertical-lr would expose bug 850504 (once support for anonymous NG table
cells is enabled), which really isn't an interesting thing to test in
these tests. To be consistent, rewrite all tests to use horizontal-tb,
not just those that previously used vertical-lr.

viewport-y-vertical-XX-rtl additionally need a fixed horizontal offset
for the absolutely positioned box in the ref. Not sure what went wrong,
but both NG and legacy decided to act up in identical ways.

Bug: 850504
Change-Id: I888db0680c5d543c9ac19a1ae8ab9ca791d8b259
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Reviewed-on: https://chromium-review.googlesource.com/1099384Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567197}