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

Source/modules/webdatabase/DatabaseContext.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 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
@@ skipping 29 matching lines @@
 
 class DatabaseContext final
     : public GarbageCollectedFinalized<DatabaseContext>
     , public ActiveDOMObject {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DatabaseContext);
 public:
     friend class DatabaseManager;
 
     static DatabaseContext* create(ExecutionContext*);
 
-    virtual ~DatabaseContext();
+    ~DatabaseContext() override;
     DECLARE_VIRTUAL_TRACE();
 
     // For life-cycle management (inherited from ActiveDOMObject):
-    virtual void contextDestroyed() override;
-    virtual void stop() override;
+    void contextDestroyed() override;
+    void stop() override;
 
     DatabaseContext* backend();
     DatabaseThread* databaseThread();
     bool databaseThreadAvailable();
 
     void setHasOpenDatabases() { m_hasOpenDatabases = true; }
     // Blocks the caller thread until cleanup tasks are completed.
     void stopDatabases();
 
     bool allowDatabaseAccess() const;
 
     SecurityOrigin* securityOrigin() const;
     bool isContextThread() const;
 
 private:
     explicit DatabaseContext(ExecutionContext*);
 
     Member<DatabaseThread> m_databaseThread;
     bool m_hasOpenDatabases; // This never changes back to false, even after the database thread is closed.
     bool m_hasRequestedTermination;
 };
 
 } // namespace blink
 
 #endif // DatabaseContext_h