Remove ScrollableArea and Scrollbar

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 bd7b96b0e9ce04b82c2b4c4c0115a8d2783940e1..5aa4aeebd164445236d940ac9b51578ce923a208 100644
--- a/sky/engine/core/page/EventHandler.h
+++ b/sky/engine/core/page/EventHandler.h
@@ -58,8 +58,6 @@ class Node;
 class OptionalCursor;
 class RenderLayer;
 class RenderObject;
-class ScrollableArea;
-class Scrollbar;
 class TextEvent;
 class VisibleSelection;
 class Widget;
@@ -115,8 +113,6 @@ private:
     bool isCursorVisible() const;
     void updateCursor();
 
-    bool isInsideScrollbar(const IntPoint&) 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