Update web classes to use OVERRIDE / FINAL when needed

Source/web/PinchViewports.h

 /*
  * Copyright (C) 2013 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 33 matching lines @@
 class IntRect;
 class IntSize;
 }
 
 namespace blink {
 
 class WebLayerTreeView;
 class WebScrollbarLayer;
 class WebViewImpl;
 
-class PinchViewports : WebCore::GraphicsLayerClient {
+class PinchViewports FINAL : WebCore::GraphicsLayerClient {
 public:
     static PassOwnPtr<PinchViewports> create(WebViewImpl* owner);
-    ~PinchViewports();
+    virtual ~PinchViewports();
 
     void setOverflowControlsHostLayer(WebCore::GraphicsLayer*);
     WebCore::GraphicsLayer* rootGraphicsLayer()
     {
         return m_innerViewportContainerLayer.get();
     }
     void setViewportSize(const WebCore::IntSize&);
 
     void registerViewportLayersWithTreeView(WebLayerTreeView*) const;
     void clearViewportLayersForTreeView(WebLayerTreeView*) const;
@@ skipping 15 matching lines @@
     OwnPtr<WebCore::GraphicsLayer> m_innerViewportScrollLayer;
     OwnPtr<WebCore::GraphicsLayer> m_overlayScrollbarHorizontal;
     OwnPtr<WebCore::GraphicsLayer> m_overlayScrollbarVertical;
     OwnPtr<WebScrollbarLayer> m_webOverlayScrollbarHorizontal;
     OwnPtr<WebScrollbarLayer> m_webOverlayScrollbarVertical;
 };
 
 } // namespace blink
 
 #endif // PinchViewports_h