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

Source/modules/quota/StorageErrorCallback.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 38 matching lines @@
     DEFINE_INLINE_VIRTUAL_TRACE() { }
     virtual void handleEvent(DOMError*) = 0;
 
     class MODULES_EXPORT CallbackTask final : public ExecutionContextTask {
     public:
         static PassOwnPtr<CallbackTask> create(StorageErrorCallback* callback, ExceptionCode ec)
         {
             return adoptPtr(new CallbackTask(callback, ec));
         }
 
-        virtual void performTask(ExecutionContext*) override;
+        void performTask(ExecutionContext*) override;
 
     private:
         CallbackTask(StorageErrorCallback*, ExceptionCode);
 
         Persistent<StorageErrorCallback> m_callback;
         ExceptionCode m_ec;
     };
 };
 
 } // namespace blink
 
 #endif // StorageErrorCallback_h