Removed ScrollingCoordinator and a bunch of composited scrolling'

sky/engine/core/rendering/compositing/RenderLayerCompositor.h

Index: sky/engine/core/rendering/compositing/RenderLayerCompositor.h
diff --git a/sky/engine/core/rendering/compositing/RenderLayerCompositor.h b/sky/engine/core/rendering/compositing/RenderLayerCompositor.h
index 0a35a7ec8b94bfb2fff6bb3e92199471af3468c6..99ff8c824006f7b9025e661cedba8f3c40f506a3 100644
--- a/sky/engine/core/rendering/compositing/RenderLayerCompositor.h
+++ b/sky/engine/core/rendering/compositing/RenderLayerCompositor.h
@@ -37,7 +37,6 @@ class DocumentLifecycle;
 class GraphicsLayer;
 class GraphicsLayerFactory;
 class Page;
-class ScrollingCoordinator;
 
 enum CompositingUpdateType {
     CompositingUpdateNone,
@@ -137,13 +136,8 @@ public:
     void frameViewDidChangeSize();
     void rootFixedBackgroundsChanged();
 
-    bool scrollingLayerDidChange(RenderLayer*);
-
     String layerTreeAsText(LayerTreeFlags);
 
-    GraphicsLayer* layerForHorizontalScrollbar() const { return m_layerForHorizontalScrollbar.get(); }
-    GraphicsLayer* layerForVerticalScrollbar() const { return m_layerForVerticalScrollbar.get(); }
-
     void resetTrackedPaintInvalidationRects();
     void setTracksPaintInvalidations(bool);
 
@@ -183,18 +177,12 @@ private:
     void attachRootLayer(RootLayerAttachment);
     void detachRootLayer();
 
-    void updateOverflowControlsLayers();
-
     Page* page() const;
 
     GraphicsLayerFactory* graphicsLayerFactory() const;
-    ScrollingCoordinator* scrollingCoordinator() const;
 
     void enableCompositingModeIfNeeded();
 
-    bool requiresHorizontalScrollbarLayer() const;
-    bool requiresVerticalScrollbarLayer() const;
-
     RenderView& m_renderView;
     OwnPtr<GraphicsLayer> m_rootContentLayer;
     OwnPtr<GraphicsLayer> m_rootTransformLayer;
@@ -224,10 +212,6 @@ private:
 
     // Enclosing layer for overflow controls and the clipping layer
     OwnPtr<GraphicsLayer> m_overflowControlsHostLayer;
-
-    // Layers for overflow controls
-    OwnPtr<GraphicsLayer> m_layerForHorizontalScrollbar;
-    OwnPtr<GraphicsLayer> m_layerForVerticalScrollbar;
 };
 
 } // namespace blink