[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/1157001Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579505}

third_party/blink/renderer/core/paint/ng/ng_box_fragment_painter.cc

@@ -608,18 +608,6 @@ void NGBoxFragmentPainter::PaintInlineChildren(
     if (child->PhysicalFragment().IsFloating())
       continue;
     if (child->PhysicalFragment().IsAtomicInline()) {
-      // legacy_paint_offset is local, so we need to remove the offset to
-      // lineBox.
-      LayoutPoint legacy_paint_offset = paint_offset;
-      const NGPaintFragment* parent = child->Parent();
-      while (parent && (parent->PhysicalFragment().IsBox() ||
-                        parent->PhysicalFragment().IsLineBox())) {
-        legacy_paint_offset -= parent->Offset().ToLayoutPoint();
-        if (parent->PhysicalFragment().IsLineBox())
-          break;
-        parent = parent->Parent();
-      }
-
       PaintAtomicInlineChild(*child, paint_info);
     } else {
       PaintInlineChild(*child, paint_info, paint_offset);