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

Source/core/editing/EditCommand.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 66 matching lines @@
 
 class SimpleEditCommand : public EditCommand {
 public:
     virtual void doUnapply() = 0;
     virtual void doReapply(); // calls doApply()
 
 protected:
     explicit SimpleEditCommand(Document& document) : EditCommand(document) { }
 
 private:
-    virtual bool isSimpleEditCommand() const override final { return true; }

[yosin_UTC9, 2015/07/07 06:40:09]

It is interesting that compiler allows to have both |override| and |final|.

+    bool isSimpleEditCommand() const final { return true; }
 };
 
 DEFINE_TYPE_CASTS(SimpleEditCommand, EditCommand, command, command->isSimpleEditCommand(), command.isSimpleEditCommand());
 
 } // namespace blink
 
 #endif // EditCommand_h