Delete unused AnimatableValue code

third_party/WebKit/Source/core/animation/animatable/AnimatableImage.cpp

 /*
  * 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * 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.
  */
 
 #include "core/animation/animatable/AnimatableImage.h"
 
 #include "core/css/CSSImageValue.h"
-#include "core/style/StyleGeneratedImage.h"
 #include "wtf/MathExtras.h"
 
 namespace blink {
 
-bool AnimatableImage::usesDefaultInterpolationWith(
-    const AnimatableValue* value) const {
-  if (!m_value->isImageValue())
-    return true;
-  if (!toAnimatableImage(value)->toCSSValue()->isImageValue())
-    return true;
-  return false;
-}
-
-PassRefPtr<AnimatableValue> AnimatableImage::interpolateTo(
-    const AnimatableValue* value,
-    double fraction) const {
-  if (fraction <= 0 || fraction >= 1 || usesDefaultInterpolationWith(value))
-    return defaultInterpolateTo(this, value, fraction);
-
-  CSSValue* fromValue = toCSSValue();
-  CSSValue* toValue = toAnimatableImage(value)->toCSSValue();
-
-  return create(CSSCrossfadeValue::create(
-      fromValue, toValue, CSSPrimitiveValue::create(
-                              fraction, CSSPrimitiveValue::UnitType::Number)));
-}
-
 bool AnimatableImage::equalTo(const AnimatableValue* value) const {
   return dataEquivalent(m_value, toAnimatableImage(value)->m_value);
 }
 
 }  // namespace blink