Update web classes to use OVERRIDE / FINAL when needed

Source/web/ContextFeaturesClientImpl.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:
  *
  *     * 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ContextFeaturesClientImpl_h
 #define ContextFeaturesClientImpl_h
 
 #include "core/dom/ContextFeatures.h"
 
 namespace blink {
 
-class ContextFeaturesClientImpl : public WebCore::ContextFeaturesClient {
+class ContextFeaturesClientImpl FINAL : public WebCore::ContextFeaturesClient {
 public:
     ContextFeaturesClientImpl() { }
 
     virtual bool isEnabled(WebCore::Document*, WebCore::ContextFeatures::FeatureType, bool defaultValue) OVERRIDE;
     virtual void urlDidChange(WebCore::Document*) OVERRIDE;
 
 private:
     bool askIfIsEnabled(WebCore::Document*, WebCore::ContextFeatures::FeatureType, bool defaultValue);
 };
 
 } // namespace blink
 
 #endif // ContextFeaturesClientImpl_h