Fix virtual/override/final usage in Source/core/editing/.

Source/core/editing/RemoveFormatCommand.h

 /*
  * Copyright (C) 2007, 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 22 matching lines @@
 class RemoveFormatCommand final : public CompositeEditCommand {
 public:
     static PassRefPtrWillBeRawPtr<RemoveFormatCommand> create(Document& document)
     {
         return adoptRefWillBeNoop(new RemoveFormatCommand(document));
     }
 
 private:
     explicit RemoveFormatCommand(Document&);
 
-    virtual void doApply() override;
-    virtual EditAction editingAction() const override { return EditActionUnspecified; }
+    void doApply() override;
+    EditAction editingAction() const override { return EditActionUnspecified; }
 };
 
 } // namespace blink
 
 #endif // RemoveFormatCommand_h