Remove WebScroll*

sky/engine/public/platform/Platform.h

Index: sky/engine/public/platform/Platform.h
diff --git a/sky/engine/public/platform/Platform.h b/sky/engine/public/platform/Platform.h
index 90e427a2ac58264f2bfff403d23515e570e46c8a..1767d046c02141b45709f70e8b2af8435ee20fda 100644
--- a/sky/engine/public/platform/Platform.h
+++ b/sky/engine/public/platform/Platform.h
@@ -64,7 +64,6 @@ class WebGestureCurve;
 class WebGraphicsContext3DProvider;
 class WebMimeRegistry;
 class WebSandboxSupport;
-class WebScrollbarBehavior;
 struct WebFloatPoint;
 class WebThemeEngine;
 class WebURL;
@@ -200,12 +199,6 @@ public:
     virtual void screenColorProfile(WebVector<char>* profile) { }
 
 
-    // Scrollbar ----------------------------------------------------------
-
-    // Must return non-null.
-    virtual WebScrollbarBehavior* scrollbarBehavior() { return 0; }
-
-
     // Sudden Termination --------------------------------------------------
 
     // Disable/Enable sudden termination.