Update web classes to use OVERRIDE / FINAL when needed

Source/web/DragClientImpl.h

 /*
  * Copyright (C) 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 27 matching lines @@
 class ClipBoard;
 class DragData;
 class DragImage;
 class IntPoint;
 class KURL;
 }
 
 namespace blink {
 class WebViewImpl;
 
-class DragClientImpl : public WebCore::DragClient {
+class DragClientImpl FINAL : public WebCore::DragClient {
 public:
     DragClientImpl(WebViewImpl* webView) : m_webView(webView) { }
 
-    virtual WebCore::DragDestinationAction actionMaskForDrag(WebCore::DragData*);
+    virtual WebCore::DragDestinationAction actionMaskForDrag(WebCore::DragData*) OVERRIDE;
     virtual void startDrag(
         WebCore::DragImage*,
         const WebCore::IntPoint& dragImageOrigin,
         const WebCore::IntPoint& eventPos,
         WebCore::Clipboard* clipboard,
         WebCore::Frame* frame,
-        bool isLinkDrag = false);
+        bool isLinkDrag = false) OVERRIDE;
 
 private:
     WebViewImpl* m_webView;
 };
 
 } // namespace blink
 
 #endif