Update web classes to use OVERRIDE / FINAL when needed

Source/web/WebPluginScrollbarImpl.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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
 namespace WebCore {
 class IntPoint;
 class IntRect;
 class Scrollbar;
 }
 
 namespace blink {
 
 class ScrollbarGroup;
 
-class WebPluginScrollbarImpl : public WebPluginScrollbar {
+class WebPluginScrollbarImpl FINAL : public WebPluginScrollbar {
 public:
     WebPluginScrollbarImpl(Orientation, ScrollbarGroup*, WebPluginScrollbarClient*);
-    ~WebPluginScrollbarImpl();
+    virtual ~WebPluginScrollbarImpl();
 
     void setScrollOffset(int);
     void invalidateScrollbarRect(const WebCore::IntRect&);
     // FIXME: Combine this with the other getTickmarks method
     void getTickmarks(Vector<WebCore::IntRect>&) const;
     WebCore::IntPoint convertFromContainingViewToScrollbar(const WebCore::IntPoint& parentPoint) const;
     void scrollbarStyleChanged();
 
     int scrollOffset() { return m_scrollOffset; }
     WebCore::Scrollbar* scrollbar() { return m_scrollbar.get(); }
@@ skipping 38 matching lines @@
     ScrollbarGroup* m_group;
     WebPluginScrollbarClient* m_client;
 
     int m_scrollOffset;
     RefPtr<WebCore::Scrollbar> m_scrollbar;
 };
 
 } // namespace blink
 
 #endif