Removed ScrollingCoordinator and a bunch of composited scrolling'

sky/engine/public/platform/WebCompositorSupport.h

Index: sky/engine/public/platform/WebCompositorSupport.h
diff --git a/sky/engine/public/platform/WebCompositorSupport.h b/sky/engine/public/platform/WebCompositorSupport.h
index bda7052fddaf7865955e3fad1376d7dd07be4bf8..735f7804c86a6f581234087fe938c280acd29984 100644
--- a/sky/engine/public/platform/WebCompositorSupport.h
+++ b/sky/engine/public/platform/WebCompositorSupport.h
@@ -72,11 +72,6 @@ public:
 
     virtual WebImageLayer* createImageLayer() { return 0; }
 
-    // The ownership of the WebScrollbarThemeGeometry pointer is passed to Chromium.
-    virtual WebScrollbarLayer* createScrollbarLayer(WebScrollbar*, WebScrollbarThemePainter, WebScrollbarThemeGeometry*) { return 0; }
-
-    virtual WebScrollbarLayer* createSolidColorScrollbarLayer(WebScrollbar::Orientation, int thumbThickness, int trackStart, bool isLeftSideVerticalScrollbar) { return 0; }
-
     // Animation ----------------------------------------------------
 
     virtual WebCompositorAnimation* createAnimation(const WebCompositorAnimationCurve&, WebCompositorAnimation::TargetProperty, int animationId = 0) { return 0; }