[LayoutNG] Remove obsolete legacy_paint_offset

Bug: 714962
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I82a2ee42527cd7186173d476826654125bbea876
Tbr: kojii@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1157001
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579505}
1 file changed