Delete unused AnimatableValue code

third_party/WebKit/Source/core/animation/animatable/AnimatableImage.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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AnimatableImage_h
 #define AnimatableImage_h
 
 #include "core/animation/animatable/AnimatableValue.h"
-#include "core/css/CSSCrossfadeValue.h"
 #include "core/style/StyleImage.h"
 
 namespace blink {
 
 class AnimatableImage final : public AnimatableValue {
  public:
   ~AnimatableImage() override {}
   static PassRefPtr<AnimatableImage> create(CSSValue* value) {
     return adoptRef(new AnimatableImage(value));
   }
-  CSSValue* toCSSValue() const { return m_value.get(); }
-
- protected:
-  PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*,
-                                            double fraction) const override;
-  bool usesDefaultInterpolationWith(const AnimatableValue*) const override;
 
  private:
   AnimatableImage(CSSValue* value) : m_value(value) { DCHECK(m_value.get()); }
   AnimatableType type() const override { return TypeImage; }
   bool equalTo(const AnimatableValue*) const override;
 
   const Persistent<CSSValue> m_value;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableImage, isImage());
 
 }  // namespace blink
 
 #endif  // AnimatableImage_h