Replace FINAL and OVERRIDE with their C++11 counterparts in Source/core/[css|rendering|clipboard]

Source/core/css/CSSUnknownRule.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef CSSUnknownRule_h
 #define CSSUnknownRule_h
 
 #include "core/css/CSSRule.h"
 
 namespace blink {
 
-class CSSUnknownRule FINAL : public CSSRule {
+class CSSUnknownRule final : public CSSRule {
 public:
     CSSUnknownRule() : CSSRule(0) { }
     virtual ~CSSUnknownRule() { }
 
-    virtual CSSRule::Type type() const OVERRIDE { return UNKNOWN_RULE; }
-    virtual String cssText() const OVERRIDE { return String(); }
-    virtual void reattach(StyleRuleBase*) OVERRIDE { }
-    virtual void trace(Visitor* visitor) OVERRIDE { CSSRule::trace(visitor); }
+    virtual CSSRule::Type type() const override { return UNKNOWN_RULE; }
+    virtual String cssText() const override { return String(); }
+    virtual void reattach(StyleRuleBase*) override { }
+    virtual void trace(Visitor* visitor) override { CSSRule::trace(visitor); }
 };
 
 } // namespace blink
 
 #endif // CSSUnknownRule_h