Remove unused code in InvalidatableInterpolation

third_party/WebKit/Source/core/animation/LegacyStyleInterpolation.h

 // Copyright 2014 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 LegacyStyleInterpolation_h
 #define LegacyStyleInterpolation_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/CoreExport.h"
 #include "core/animation/Interpolation.h"
@@ skipping 46 matching lines @@
 
  private:
   const std::unique_ptr<InterpolableValue> m_start;
   const std::unique_ptr<InterpolableValue> m_end;
   CSSPropertyID m_id;
 
   mutable double m_cachedFraction;
   mutable int m_cachedIteration;
   mutable std::unique_ptr<InterpolableValue> m_cachedValue;
 
-  InterpolableValue* getCachedValueForTesting() const final {
+  InterpolableValue* getCachedValueForTesting() const {
     return m_cachedValue.get();
   }
+
+  friend class AnimationInterpolableValueTest;
+  friend class AnimationInterpolationEffectTest;
 };
 
 DEFINE_TYPE_CASTS(LegacyStyleInterpolation,
                   Interpolation,
                   value,
                   value->isLegacyStyleInterpolation(),
                   value.isLegacyStyleInterpolation());
 
 }  // namespace blink
 
 #endif