Get rid of unused functions NGInlineCursor::Line{Start,End}Point()

This patch gets rid of unused functions |Line{Start,End}Point()| in
|NGInlineCursor| for improving code health.

CLs[1][2] made these functions unused.

[1] http://crrev.com/c/2467046 Make NGInlineCursor::
PositionForEndOfLine() not to use hit-testing
[2] http://crrev.com/c/2497742 Make NGInlineCursor::
PositionForStartOfLine() not to use hit-testing

Bug: 1136740
Change-Id: I3032907a738560f0789512be80175cfca2c8e2d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500687
Auto-Submit: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821124}

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

@@ -655,25 +655,6 @@ LayoutUnit NGInlineCursor::InlinePositionForOffset(unsigned offset) const {
   return LayoutUnit();
 }
 
-PhysicalOffset NGInlineCursorPosition::LineStartPoint() const {
-  DCHECK(IsLineBox()) << this;
-  const LogicalOffset logical_start;  // (0, 0)
-  const PhysicalSize pixel_size(LayoutUnit(1), LayoutUnit(1));
-  return logical_start.ConvertToPhysical(
-      {Style().GetWritingMode(), BaseDirection()}, Size(), pixel_size);
-}
-
-PhysicalOffset NGInlineCursorPosition::LineEndPoint() const {
-  DCHECK(IsLineBox()) << this;
-  const WritingMode writing_mode = Style().GetWritingMode();
-  const LayoutUnit inline_size =
-      IsHorizontalWritingMode(writing_mode) ? Size().width : Size().height;
-  const LogicalOffset logical_end(inline_size, LayoutUnit());
-  const PhysicalSize pixel_size(LayoutUnit(1), LayoutUnit(1));
-  return logical_end.ConvertToPhysical({writing_mode, BaseDirection()}, Size(),
-                                       pixel_size);
-}
-
 LogicalRect NGInlineCursorPosition::ConvertChildToLogical(
     const PhysicalRect& physical_rect) const {
   return WritingModeConverter(

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

@@ -173,12 +173,6 @@ class CORE_EXPORT NGInlineCursorPosition {
   // other than line.
   bool HasSoftWrapToNextLine() const;
 
-  // Returns a point at the visual start/end of the line. (0, 0) is left-top of
-  // the line.
-  // Encapsulates the handling of text direction and writing mode.
-  PhysicalOffset LineStartPoint() const;
-  PhysicalOffset LineEndPoint() const;
-
   // LogicalRect/PhysicalRect conversions
   // |logical_rect| and |physical_rect| are converted with |Size()| as
   // "outer size".