Remove RenderLayerScrollableArea

sky/engine/core/page/EventHandler.h

Index: sky/engine/core/page/EventHandler.h
diff --git a/sky/engine/core/page/EventHandler.h b/sky/engine/core/page/EventHandler.h
index e39da8a2f3193efface424571fc181fe8ae6234f..bd7b96b0e9ce04b82c2b4c4c0115a8d2783940e1 100644
--- a/sky/engine/core/page/EventHandler.h
+++ b/sky/engine/core/page/EventHandler.h
@@ -57,7 +57,6 @@ class LocalFrame;
 class Node;
 class OptionalCursor;
 class RenderLayer;
-class RenderLayerScrollableArea;
 class RenderObject;
 class ScrollableArea;
 class Scrollbar;
@@ -118,8 +117,6 @@ private:
 
     bool isInsideScrollbar(const IntPoint&) const;
 
-    ScrollableArea* associatedScrollableArea(const RenderLayer*) const;
-
     // Scrolls the elements of the DOM tree. Returns true if a node was scrolled.
     // False if we reached the root and couldn't scroll anything.
     // direction - The direction to scroll in. If this is a logicl direction, it will be