Update web classes to use OVERRIDE / FINAL when needed

Source/web/ScrollbarGroup.h

 /*
  * Copyright (C) 2011 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 20 matching lines @@
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 class FrameView;
 }
 
 namespace blink {
 
 class WebPluginScrollbarImpl;
 
-class ScrollbarGroup : public WebCore::ScrollableArea {
+class ScrollbarGroup FINAL : public WebCore::ScrollableArea {
 public:
     ScrollbarGroup(WebCore::FrameView*, const WebCore::IntRect& frameRect);
-    ~ScrollbarGroup();
+    virtual ~ScrollbarGroup();
 
     void scrollbarCreated(WebPluginScrollbarImpl*);
     void scrollbarDestroyed(WebPluginScrollbarImpl*);
     void setLastMousePosition(const WebCore::IntPoint&);
     void setFrameRect(const WebCore::IntRect&);
 
     // WebCore::ScrollableArea methods
     virtual int scrollSize(WebCore::ScrollbarOrientation) const OVERRIDE;
     virtual void setScrollOffset(const WebCore::IntPoint&) OVERRIDE;
     virtual void invalidateScrollbarRect(WebCore::Scrollbar*, const WebCore::IntRect&) OVERRIDE;
@@ skipping 26 matching lines @@
     WebCore::FrameView* m_frameView;
     WebCore::IntPoint m_lastMousePosition;
     WebCore::IntRect m_frameRect;
     WebPluginScrollbarImpl* m_horizontalScrollbar;
     WebPluginScrollbarImpl* m_verticalScrollbar;
 };
 
 } // namespace blink
 
 #endif