[masonry] Remove unused function itemGridAreaStartsAtFirstLine

https://bugs.webkit.org/show_bug.cgi?id=267767
rdar://problem/121259639

Reviewed by Sammy Gill.

Remove unused function. It is not needed anymore.

* Source/WebCore/rendering/GridMasonryLayout.h:
(WebCore::GridMasonryLayout::itemGridAreaStartsAtFirstLine): Deleted.

Canonical link: https://commits.webkit.org/273226@main

Source/WebCore/rendering/GridMasonryLayout.h

@@ -67,10 +67,6 @@ class GridMasonryLayout {
     inline GridTrackSizingDirection gridAxisDirection() const;
 
     bool hasDefiniteGridAxisPosition(const RenderBox& child, GridTrackSizingDirection masonryDirection) const;
-    static bool itemGridAreaStartsAtFirstLine(const GridArea& area, GridTrackSizingDirection masonryDirection)
-    {
-        return !(masonryDirection == GridTrackSizingDirection::ForRows ? area.rows.startLine() : area.columns.startLine());
-    }
     GridArea masonryGridAreaFromGridAxisSpan(const GridSpan&) const;
     GridSpan gridAxisSpanFromArea(const GridArea&) const;
     bool hasEnoughSpaceAtPosition(unsigned startingPosition, unsigned spanLength) const;