[Oilpan] Migrate most classes under core/animations to Oilpan heap.

Source/core/animation/animatable/AnimatableShapeValue.h

Index: Source/core/animation/animatable/AnimatableShapeValue.h
diff --git a/Source/core/animation/animatable/AnimatableShapeValue.h b/Source/core/animation/animatable/AnimatableShapeValue.h
index a5572b2a41ce1c9c2983294394ec70acd1f620c3..c863db4933742f17a975d85d8ed15e4e50e3f1e1 100644
--- a/Source/core/animation/animatable/AnimatableShapeValue.h
+++ b/Source/core/animation/animatable/AnimatableShapeValue.h
@@ -40,16 +40,16 @@ namespace blink {
 class CORE_EXPORT AnimatableShapeValue final : public AnimatableValue {
 public:
     virtual ~AnimatableShapeValue() { }
-    static PassRefPtrWillBeRawPtr<AnimatableShapeValue> create(ShapeValue* shape)
+    static AnimatableShapeValue* create(ShapeValue* shape)
     {
-        return adoptRefWillBeNoop(new AnimatableShapeValue(shape));
+        return new AnimatableShapeValue(shape);
     }
     ShapeValue* shapeValue() const { return m_shape.get(); }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { AnimatableValue::trace(visitor); }
 
 protected:
-    virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
+    virtual AnimatableValue* interpolateTo(const AnimatableValue*, double fraction) const override;
     virtual bool usesDefaultInterpolationWith(const AnimatableValue*) const override;
 
 private: