Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/scroll/FramelessScrollView.h

 /*
  * Copyright (c) 2008, 2009, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 56 matching lines @@
     virtual bool handleGestureEvent(const PlatformGestureEvent&) = 0;
 
     // ScrollableArea public methods:
     virtual void invalidateScrollbarRect(Scrollbar*, const IntRect&) OVERRIDE;
     virtual bool isActive() const OVERRIDE;
     virtual ScrollableArea* enclosingScrollableArea() const OVERRIDE;
     virtual bool scrollbarsCanBeActive() const OVERRIDE;
     virtual IntRect scrollableAreaBoundingBox() const OVERRIDE;
 
     // Widget public methods:
-    virtual void invalidateRect(const IntRect&);
+    virtual void invalidateRect(const IntRect&) OVERRIDE;
 
     // ScrollView public methods:
-    virtual HostWindow* hostWindow() const;
-    virtual IntRect windowClipRect(bool clipToContents = true) const;
+    virtual HostWindow* hostWindow() const OVERRIDE;
+    virtual IntRect windowClipRect(bool clipToContents = true) const OVERRIDE;
 
 protected:
     // ScrollView protected methods:
-    virtual void paintContents(GraphicsContext*, const IntRect&);
-    virtual void contentsResized();
-    virtual void scrollbarExistenceDidChange();
+    virtual void paintContents(GraphicsContext*, const IntRect&) OVERRIDE;
+    virtual void contentsResized() OVERRIDE;
+    virtual void scrollbarExistenceDidChange() OVERRIDE;
 
 private:
     FramelessScrollViewClient* m_client;
 };
 
 } // namespace WebCore
 
 #endif