Get rid of unused function NGPhysicalLineBoxFragment::ClosestLeafChildForPoint()

This patch gets rid of unused function |ClosestLeafChildForPoint()| in
|NGPhysicalLineBoxFragment| for improving code health.

This patch is follow-up of the patch[1] which gets rid of clients of
|ClosestLeafChildForPoint()|.

[1] http://crrev.com/c/1875856 Introduce NGInlineCursor version of
ClosestLeafChildForPoint() for AbstractLineBox

Change-Id: Ia626b7e77ac415c6d2164072b50f3b34fcbe6b4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877874
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Auto-Submit: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709825}

third_party/blink/renderer/core/layout/ng/inline/ng_physical_line_box_fragment.cc

@@ -24,18 +24,6 @@ static_assert(sizeof(NGPhysicalLineBoxFragment) ==
                   sizeof(SameSizeAsNGPhysicalLineBoxFragment),
               "NGPhysicalLineBoxFragment should stay small");
 
-bool IsInlineLeaf(const NGPhysicalFragment& fragment) {
-  if (fragment.IsText())
-    return true;
-  return fragment.IsBox() && fragment.IsAtomicInline();
-}
-
-bool IsEditableFragment(const NGPhysicalFragment& fragment) {
-  if (!fragment.GetNode())
-    return false;
-  return HasEditableStyle(*fragment.GetNode());
-}
-
 }  // namespace
 
 scoped_refptr<const NGPhysicalLineBoxFragment>
@@ -151,47 +139,4 @@ PhysicalOffset NGPhysicalLineBoxFragment::LineEndPoint() const {
                                        BaseDirection(), Size(), pixel_size);
 }
 
-const LayoutObject* NGPhysicalLineBoxFragment::ClosestLeafChildForPoint(
-    const PhysicalOffset& point,
-    bool only_editable_leaves) const {
-  const PhysicalSize unit_square(LayoutUnit(1), LayoutUnit(1));
-  const LogicalOffset logical_point = point.ConvertToLogical(
-      Style().GetWritingMode(), BaseDirection(), Size(), unit_square);
-  const LayoutUnit inline_offset = logical_point.inline_offset;
-  const NGPhysicalFragment* closest_leaf_child = nullptr;
-  LayoutUnit closest_leaf_distance;
-  for (const auto& descendant :
-       NGInlineFragmentTraversal::DescendantsOf(*this)) {
-    const NGPhysicalFragment& fragment = *descendant.fragment;
-    if (!fragment.GetLayoutObject())
-      continue;
-    if (!IsInlineLeaf(fragment) || fragment.IsListMarker())
-      continue;
-    if (only_editable_leaves && !IsEditableFragment(fragment))
-      continue;
-
-    const LogicalSize fragment_logical_size =
-        fragment.Size().ConvertToLogical(Style().GetWritingMode());
-    const LogicalOffset fragment_logical_offset =
-        descendant.offset_to_container_box.ConvertToLogical(
-            Style().GetWritingMode(), BaseDirection(), Size(), fragment.Size());
-    const LayoutUnit inline_min = fragment_logical_offset.inline_offset;
-    const LayoutUnit inline_max = fragment_logical_offset.inline_offset +
-                                  fragment_logical_size.inline_size;
-    if (inline_offset >= inline_min && inline_offset < inline_max)
-      return fragment.GetLayoutObject();
-
-    const LayoutUnit distance =
-        inline_offset < inline_min ? inline_min - inline_offset
-                                   : inline_offset - inline_max + LayoutUnit(1);
-    if (!closest_leaf_child || distance < closest_leaf_distance) {
-      closest_leaf_child = &fragment;
-      closest_leaf_distance = distance;
-    }
-  }
-  if (!closest_leaf_child)
-    return nullptr;
-  return closest_leaf_child->GetLayoutObject();
-}
-
 }  // namespace blink

third_party/blink/renderer/core/layout/ng/inline/ng_physical_line_box_fragment.h

@@ -64,9 +64,6 @@ class CORE_EXPORT NGPhysicalLineBoxFragment final
                                   const ComputedStyle* container_style,
                                   PhysicalSize container_physical_size) const;
 
-  const LayoutObject* ClosestLeafChildForPoint(const PhysicalOffset&,
-                                               bool only_editable_leaves) const;
-
   // Returns a point at the visual start/end of the line.
   // Encapsulates the handling of text direction and writing mode.
   PhysicalOffset LineStartPoint() const;