[FragmentItem] Remove unused PaintLineBoxItem function

This patch removes unused function |NGBoxFragmentPainter::
PaintLineBoxItem|.

This became unused when r731835 crrev.com/c/1994556 switched
line box painter to |PaintBlockFlowContents|.

Bug: 982194
Change-Id: I51f9f1661f2462c6faba55e646c251e9992ecc78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2143889
Auto-Submit: Koji Ishii <kojii@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758439}

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

@@ -1437,22 +1437,6 @@ void NGBoxFragmentPainter::PaintTextItem(const NGInlineCursor& cursor,
   text_painter.Paint(paint_info, paint_offset);
 }
 
-NGBoxFragmentPainter::MoveTo NGBoxFragmentPainter::PaintLineBoxItem(
-    const NGFragmentItem& item,
-    const PaintInfo& paint_info,
-    const PhysicalOffset& paint_offset) {
-  DCHECK_EQ(item.Type(), NGFragmentItem::kLine);
-  DCHECK(items_);
-  // TODO(kojii): Check CullRect.
-  const PhysicalOffset line_box__offset =
-      paint_offset + item.OffsetInContainerBlock();
-  const NGPhysicalLineBoxFragment* line_box_fragment = item.LineBoxFragment();
-  DCHECK(line_box_fragment);
-  PaintLineBox(*line_box_fragment, item, /* line_box_paint_fragment */ nullptr,
-               &item, paint_info, line_box__offset);
-  return kDontSkipChildren;
-}
-
 // Paint non-culled box item.
 void NGBoxFragmentPainter::PaintBoxItem(
     const NGFragmentItem& item,

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

@@ -154,9 +154,6 @@ class NGBoxFragmentPainter : public BoxPainterBase {
                      const PaintInfo&,
                      const PhysicalOffset& paint_offset,
                      const PhysicalOffset& parent_offset);
-  MoveTo PaintLineBoxItem(const NGFragmentItem& item,
-                          const PaintInfo& paint_info,
-                          const PhysicalOffset& paint_offset);
   void PaintBoxItem(const NGFragmentItem& item,
                     const NGPhysicalBoxFragment& child_fragment,
                     const NGInlineCursor& cursor,