Remove FrameViewBase as base class of PluginView.

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

 /*
  * Copyright (C) 2004, 2006 Apple Computer, 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 111 matching lines @@
   ScrollableArea* GetScrollableArea() const { return scrollable_area_; }
 
   int PressedPos() const { return pressed_pos_; }
 
   virtual void SetHoveredPart(ScrollbarPart);
   virtual void SetPressedPart(ScrollbarPart);
 
   void SetProportion(int visible_size, int total_size);
   void SetPressedPos(int p) { pressed_pos_ = p; }
 
-  void Paint(GraphicsContext&, const CullRect&) const final;
+  void Paint(GraphicsContext&, const CullRect&) const;
 
   bool IsOverlayScrollbar() const override;
   bool ShouldParticipateInHitTesting();
 
   bool IsWindowActive() const;
 
   // Return if the gesture event was handled. |shouldUpdateCapture|
   // will be set to true if the handler should update the capture
   // state for this scrollbar.
   bool GestureEvent(const WebGestureEvent&, bool* should_update_capture);
@@ skipping 119 matching lines @@
 
 DEFINE_TYPE_CASTS(Scrollbar,
                   FrameViewBase,
                   frameViewBase,
                   frameViewBase->IsScrollbar(),
                   frameViewBase.IsScrollbar());
 
 }  // namespace blink
 
 #endif  // Scrollbar_h