Fix virtual/override/final usage in Source/core/{animation,css,style}/.

Source/core/animation/NumberOptionalNumberSVGInterpolation.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NumberOptionalNumberSVGInterpolation_h
 #define NumberOptionalNumberSVGInterpolation_h
 
 #include "core/animation/SVGInterpolation.h"
 #include "core/svg/SVGNumber.h"
 #include "core/svg/SVGNumberOptionalNumber.h"
 
 namespace blink {
 
 class SVGNumberOptionalNumber;
 
 class NumberOptionalNumberSVGInterpolation : public SVGInterpolation {
 public:
     static PassRefPtrWillBeRawPtr<NumberOptionalNumberSVGInterpolation> create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
     {
         return adoptRefWillBeNoop(new NumberOptionalNumberSVGInterpolation(toInterpolableValue(start), toInterpolableValue(end), attribute));
     }
 
-    virtual PassRefPtrWillBeRawPtr<SVGPropertyBase> interpolatedValue(SVGElement&) const override final
+    PassRefPtrWillBeRawPtr<SVGPropertyBase> interpolatedValue(SVGElement&) const final
     {
         return fromInterpolableValue(*m_cachedValue);
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         SVGInterpolation::trace(visitor);
     }
 
 private:
@@ skipping 16 matching lines @@
         const InterpolableList& list = toInterpolableList(value);
         return SVGNumberOptionalNumber::create(
             SVGNumber::create(toInterpolableNumber(list.get(0))->value()),
             SVGNumber::create(toInterpolableNumber(list.get(1))->value()));
     }
 };
 
 }
 
 #endif // NumberOptionalNumberSVGInterpolation_h