Remove frame flattening from rendering code.

Source/core/page/FrameView.h

Index: Source/core/page/FrameView.h
diff --git a/Source/core/page/FrameView.h b/Source/core/page/FrameView.h
index b8fcccb71344ea40a73d812e62b7880b1025664b..67eb97c5831f5abb898c6cc3c6706d22a4c70d01 100644
--- a/Source/core/page/FrameView.h
+++ b/Source/core/page/FrameView.h
@@ -91,8 +91,6 @@ public:
 
     virtual PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
 
-    virtual bool avoidScrollbarCreation() const;
-
     virtual void setContentsSize(const IntSize&);
 
     void layout(bool allowSubtree = true);
@@ -238,8 +236,6 @@ public:
 
     Color documentBackgroundColor() const;
 
-    bool isInChildFrameWithFrameFlattening() const;
-
     static double currentPaintTimeStamp() { return sCurrentPaintTimeStamp; } // returns 0 if not painting
     
     void updateLayoutAndStyleIfNeededRecursive();
@@ -432,8 +428,6 @@ private:
 
     FrameView* parentFrameView() const;
 
-    bool doLayoutWithFrameFlattening(bool allowSubtree);
-
     virtual AXObjectCache* axObjectCache() const;
     void removeFromAXObjectCache();