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The bug no longer reproduces. Remove the failure expectation, rename it
to scrolling-neg-z-index-descendants.html because there is no repaint
needed for the composited neg-z-index layer, and update the baseline.

Bug: 702006
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I87f2f2d93b8024a21aed5929f1fe601065db9806
Reviewed-on: https://chromium-review.googlesource.com/1181522
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584628}