Add missing virtual keyword for methods with OVERRIDE

Source/core/editing/CompositeEditCommand.h

 /*
  * Copyright (C) 2005, 2006, 2008 Apple 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 150 matching lines @@
     bool breakOutOfEmptyListItem();
     bool breakOutOfEmptyMailBlockquotedParagraph();
 
     Position positionAvoidingSpecialElementBoundary(const Position&);
 
     PassRefPtr<Node> splitTreeToNode(Node*, Node*, bool splitAncestor = false);
 
     Vector<RefPtr<EditCommand> > m_commands;
 
 private:
-    bool isCompositeEditCommand() const OVERRIDE FINAL { return true; }
+    virtual bool isCompositeEditCommand() const OVERRIDE FINAL { return true; }
 
     RefPtr<EditCommandComposition> m_composition;
 };
 
 DEFINE_TYPE_CASTS(CompositeEditCommand, EditCommand, command, command->isCompositeEditCommand(), command.isCompositeEditCommand());
 
 } // namespace WebCore
 
 #endif // CompositeEditCommand_h