Get rid of slow repaint objects and main thread scrolling reasons.

sky/engine/core/frame/FrameView.h

Index: sky/engine/core/frame/FrameView.h
diff --git a/sky/engine/core/frame/FrameView.h b/sky/engine/core/frame/FrameView.h
index 203e7bcf6723afca32a68c528c089e35625470e3..5bff1a44f301657d6536b4c4f4096350c3e876b2 100644
--- a/sky/engine/core/frame/FrameView.h
+++ b/sky/engine/core/frame/FrameView.h
@@ -141,10 +141,6 @@ public:
     AtomicString mediaType() const;
     void setMediaType(const AtomicString&);
 
-    void addSlowRepaintObject();
-    void removeSlowRepaintObject();
-    bool hasSlowRepaintObjects() const { return m_slowRepaintObjectCount; }
-
     void restoreScrollbar();
 
     void postLayoutTimerFired(Timer<FrameView>*);
@@ -355,7 +351,6 @@ private:
 
     // FIXME(sky): Remove
     bool m_canHaveScrollbars;
-    unsigned m_slowRepaintObjectCount;
 
     bool m_hasPendingLayout;
     RenderObject* m_layoutSubtreeRoot;