Update animation classes to use OVERRIDE / FINAL when needed

Source/core/animation/AnimatableLength.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 28 matching lines @@
 namespace WebCore {
 
 enum NumberRange {
     AllValues,
     NonNegativeValues,
 };
 
 // Handles animation of CSS length and percentage values including CSS calc.
 // See primitiveUnitToNumberType() for the list of supported units.
 // If created from a CSSPrimitiveValue this class will cache it to be returned in toCSSValue().
-class AnimatableLength : public AnimatableValue {
+class AnimatableLength FINAL : public AnimatableValue {
 public:
     enum NumberUnitType {
         UnitTypeCalc,
         UnitTypePixels,
         UnitTypePercentage,
         UnitTypeFontSize,
         UnitTypeFontXSize,
         UnitTypeRootFontSize,
         UnitTypeViewportWidth,
         UnitTypeViewportHeight,
@@ skipping 98 matching lines @@
     mutable RefPtr<CSSPrimitiveValue> m_cachedCSSPrimitiveValue;
 
     friend class AnimationAnimatableLengthTest;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableLength, isLength());
 
 } // namespace WebCore
 
 #endif // AnimatableLength_h