Remove frame flattening from rendering code.

Source/core/rendering/RenderFrameBase.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef RenderFrameBase_h
 #define RenderFrameBase_h
 
 #include "core/rendering/RenderPart.h"
 
 namespace WebCore {
 
 // Base class for RenderFrame and RenderIFrame
 class RenderFrameBase : public RenderPart {
+
+// FIXME: Remove this file. http://crbug.com/231898
+
 protected:
     explicit RenderFrameBase(Element*);
-
-public:
-    void layoutWithFlattening(bool fixedWidth, bool fixedHeight);
 };
 
 } // namespace WebCore
 
 #endif // RenderFrameBase_h