Delete unused AnimatableValue code

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

Index: third_party/WebKit/Source/core/animation/animatable/AnimatableVisibility.cpp
diff --git a/third_party/WebKit/Source/core/animation/animatable/AnimatableVisibility.cpp b/third_party/WebKit/Source/core/animation/animatable/AnimatableVisibility.cpp
index 0f7f049f573375005575da3dc68e8bafe4cd10b3..35c70842ae9f56d1f663ace82af43eb6f8a87c20 100644
--- a/third_party/WebKit/Source/core/animation/animatable/AnimatableVisibility.cpp
+++ b/third_party/WebKit/Source/core/animation/animatable/AnimatableVisibility.cpp
@@ -32,27 +32,6 @@
 
 namespace blink {
 
-bool AnimatableVisibility::usesDefaultInterpolationWith(
-    const AnimatableValue* value) const {
-  EVisibility from = m_visibility;
-  EVisibility to = toAnimatableVisibility(value)->m_visibility;
-  return from != EVisibility::kVisible && to != EVisibility::kVisible;
-}
-
-PassRefPtr<AnimatableValue> AnimatableVisibility::interpolateTo(
-    const AnimatableValue* value,
-    double fraction) const {
-  EVisibility from = m_visibility;
-  EVisibility to = toAnimatableVisibility(value)->m_visibility;
-  if (from != EVisibility::kVisible && to != EVisibility::kVisible)
-    return defaultInterpolateTo(this, value, fraction);
-  if (fraction <= 0)
-    return takeConstRef(this);
-  if (fraction >= 1)
-    return takeConstRef(value);
-  return takeConstRef(from == EVisibility::kVisible ? this : value);
-}
-
 bool AnimatableVisibility::equalTo(const AnimatableValue* value) const {
   return m_visibility == toAnimatableVisibility(value)->m_visibility;
 }