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

Source/core/animation/SVGInterpolation.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 SVGInterpolation_h
 #define SVGInterpolation_h
 
 #include "core/animation/Interpolation.h"
 #include "core/animation/PropertyHandle.h"
 #include "core/svg/properties/SVGAnimatedProperty.h"
 
 namespace blink {
 
 class SVGInterpolation : public Interpolation {
 public:
-    virtual bool isSVGInterpolation() const override final { return true; }
+    bool isSVGInterpolation() const final { return true; }
 
     SVGAnimatedPropertyBase* attribute() const { return m_attribute.get(); }
 
     const QualifiedName& attributeName() const { return m_attribute->attributeName(); }
 
-    virtual PropertyHandle property() const override final
+    PropertyHandle property() const final
     {
         return PropertyHandle(attributeName());
     }
 
     void apply(SVGElement&) const;
 
     virtual PassRefPtrWillBeRawPtr<SVGPropertyBase> interpolatedValue(SVGElement&) const = 0;
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_attribute);
         Interpolation::trace(visitor);
     }
 
 protected:
     SVGInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
         : Interpolation(start, end)
         , m_attribute(attribute)
     {
     }
 
     RefPtrWillBeMember<SVGAnimatedPropertyBase> m_attribute;
 };
 
 DEFINE_TYPE_CASTS(SVGInterpolation, Interpolation, value, value->isSVGInterpolation(), value.isSVGInterpolation());
 
 }
 
 #endif // SVGInterpolation_h