Parameterize legacy-only leftovers in HitTestingBidiTest

The entire test suite should be parameterized for legacy and LayoutNG,
but there are some leftover legacy-only tests due to search-and-replace
errors.

This patch parameterizes all such leftovers.

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: Ia3979861c4213142c4361d1d9d45250e5c9a1772
Reviewed-on: https://chromium-review.googlesource.com/1241153
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593712}