Delete unused AnimatableValue code

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

Index: third_party/WebKit/Source/core/animation/animatable/AnimatableLengthSize.cpp
diff --git a/third_party/WebKit/Source/core/animation/animatable/AnimatableLengthSize.cpp b/third_party/WebKit/Source/core/animation/animatable/AnimatableLengthSize.cpp
index 8c6fbf954db238ef98e51a85911f63ba304ea927..c464f43136d44f1345acd1e9e027cd3a84010d56 100644
--- a/third_party/WebKit/Source/core/animation/animatable/AnimatableLengthSize.cpp
+++ b/third_party/WebKit/Source/core/animation/animatable/AnimatableLengthSize.cpp
@@ -32,28 +32,10 @@
 
 namespace blink {
 
-PassRefPtr<AnimatableValue> AnimatableLengthSize::interpolateTo(
-    const AnimatableValue* value,
-    double fraction) const {
-  const AnimatableLengthSize* lengthSize = toAnimatableLengthSize(value);
-  return AnimatableLengthSize::create(
-      AnimatableValue::interpolate(this->width(), lengthSize->width(),
-                                   fraction),
-      AnimatableValue::interpolate(this->height(), lengthSize->height(),
-                                   fraction));
-}
-
 bool AnimatableLengthSize::equalTo(const AnimatableValue* value) const {
   const AnimatableLengthSize* lengthSize = toAnimatableLengthSize(value);
-  return width()->equals(lengthSize->width()) &&
-         height()->equals(lengthSize->height());
-}
-
-bool AnimatableLengthSize::usesDefaultInterpolationWith(
-    const AnimatableValue* other) const {
-  const AnimatableLengthSize* lengthSize = toAnimatableLengthSize(other);
-  return usesDefaultInterpolation(width(), lengthSize->width()) ||
-         usesDefaultInterpolation(height(), lengthSize->height());
+  return m_width->equals(lengthSize->m_width.get()) &&
+         m_height->equals(lengthSize->m_height.get());
 }
 
 }  // namespace blink