Delete most of rendering/compositing.

sky/engine/core/rendering/RenderLayerScrollableArea.h

Index: sky/engine/core/rendering/RenderLayerScrollableArea.h
diff --git a/sky/engine/core/rendering/RenderLayerScrollableArea.h b/sky/engine/core/rendering/RenderLayerScrollableArea.h
index c95daa6021106243080247644bf39edaa906edd6..1ea1c568a602491f20a43e137c0c462d95a02cec 100644
--- a/sky/engine/core/rendering/RenderLayerScrollableArea.h
+++ b/sky/engine/core/rendering/RenderLayerScrollableArea.h
@@ -127,7 +127,7 @@ public:
     // layers never get added to the FrameView's collection.
     bool scrollsOverflow() const { return m_scrollsOverflow; }
 
-    void updateNeedsCompositedScrolling();
+    // FIXME(sky): Remove
     bool needsCompositedScrolling() const { return m_needsCompositedScrolling; }
 
     // These are used during compositing updates to determine if the overflow
@@ -166,8 +166,6 @@ private:
 
     void updateScrollableAreaSet(bool hasOverflow);
 
-    void updateCompositingLayersAfterScroll();
-
     RenderLayer& m_layer;
 
     unsigned m_scrollsOverflow : 1;