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The tests were written for testing horizontal-bt (crrev.com/128a4df4).
Then when we removed horizontal-bt mode, we changed them to test
vertical-rl, but the changed tests try to repaint something totally
invisible. I'm deleting them because they are actually testing nothing,
and I don't know the original intent.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Ie807413e8ebec50b01ed0c18eef6153ad9114677
Reviewed-on: https://chromium-review.googlesource.com/749626Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513301}