Fix virtual/override/final usage in Source/web/.

Source/web/ExternalDateTimeChooser.cpp

 /*
  * 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 27 matching lines @@
 namespace blink {
 
 class WebDateTimeChooserCompletionImpl : public WebDateTimeChooserCompletion {
 public:
     WebDateTimeChooserCompletionImpl(ExternalDateTimeChooser* chooser)
         : m_chooser(chooser)
     {
     }
 
 private:
-    virtual void didChooseValue(const WebString& value) override
+    void didChooseValue(const WebString& value) override
     {
         m_chooser->didChooseValue(value);
         delete this;
     }
 
-    virtual void didChooseValue(double value) override
+    void didChooseValue(double value) override
     {
         m_chooser->didChooseValue(value);
         delete this;
     }
 
-    virtual void didCancelChooser() override
+    void didCancelChooser() override
     {
         m_chooser->didCancelChooser();
         delete this;
     }
 
     RefPtr<ExternalDateTimeChooser> m_chooser;
 };
 
 ExternalDateTimeChooser::~ExternalDateTimeChooser()
 {
@@ skipping 96 matching lines @@
 }
 
 AXObject* ExternalDateTimeChooser::rootAXObject()
 {
     return 0;
 }
 
 } // namespace blink
 
 #endif