Scrollbar no longer inherits from FrameViewBase.

third_party/WebKit/Source/platform/scroll/ScrollbarThemeClient.h

 /*
  * Copyright (C) 2012 Google 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
@@ skipping 17 matching lines @@
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/IntPoint.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/wtf/Vector.h"
 
 namespace blink {
 
-class FrameViewBase;
-
 class PLATFORM_EXPORT ScrollbarThemeClient {
  public:
   virtual int X() const = 0;
   virtual int Y() const = 0;
   virtual int Width() const = 0;
   virtual int Height() const = 0;
   virtual IntSize Size() const = 0;
   virtual IntPoint Location() const = 0;
 
-  virtual FrameViewBase* Parent() const = 0;
-  virtual FrameViewBase* Root() const = 0;
-
   virtual void SetFrameRect(const IntRect&) = 0;
   virtual IntRect FrameRect() const = 0;
 
   virtual void Invalidate() = 0;
   virtual void InvalidateRect(const IntRect&) = 0;
 
   virtual ScrollbarOverlayColorTheme GetScrollbarOverlayColorTheme() const = 0;
   virtual void GetTickmarks(Vector<IntRect>&) const = 0;
   virtual bool IsScrollableAreaActive() const = 0;
 
@@ skipping 25 matching lines @@
   virtual float ElasticOverscroll() const = 0;
   virtual void SetElasticOverscroll(float) = 0;
 
  protected:
   virtual ~ScrollbarThemeClient() {}
 };
 
 }  // namespace blink
 
 #endif  // ScollbarThemeClient_h