Remove flipForWritingMode.

sky/engine/core/rendering/RenderBox.h

Index: sky/engine/core/rendering/RenderBox.h
diff --git a/sky/engine/core/rendering/RenderBox.h b/sky/engine/core/rendering/RenderBox.h
index 90b23708d4b1127cee281d1d2031af04b669fa93..0571320d95b8a925d27ed42822676b88f87c1fa2 100644
--- a/sky/engine/core/rendering/RenderBox.h
+++ b/sky/engine/core/rendering/RenderBox.h
@@ -519,14 +519,6 @@ public:
     virtual LayoutUnit offsetLeft() const override;
     virtual LayoutUnit offsetTop() const override;
 
-    LayoutPoint flipForWritingModeForChild(const RenderBox* child, const LayoutPoint&) const;
-    LayoutUnit flipForWritingMode(LayoutUnit position) const; // The offset is in the block direction (y for horizontal writing modes, x for vertical writing modes).
-    LayoutPoint flipForWritingMode(const LayoutPoint&) const;
-    LayoutPoint flipForWritingModeIncludingColumns(const LayoutPoint&) const;
-    LayoutSize flipForWritingMode(const LayoutSize&) const;
-    void flipForWritingMode(LayoutRect&) const;
-    FloatPoint flipForWritingMode(const FloatPoint&) const;
-    void flipForWritingMode(FloatRect&) const;
     // These represent your location relative to your container as a physical offset.
     // In layout related methods you almost always want the logical location (e.g. x() and y()).
     LayoutPoint topLeftLocation() const;