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

Source/core/animation/animatable/AnimatableLengthBoxAndBool.h

Index: Source/core/animation/animatable/AnimatableLengthBoxAndBool.h
diff --git a/Source/core/animation/animatable/AnimatableLengthBoxAndBool.h b/Source/core/animation/animatable/AnimatableLengthBoxAndBool.h
index 56dc8ed6fe3a67a8b2e8cea1160c90f44b063e88..f73573674829c5c4cf561566ce8005c84f37990c 100644
--- a/Source/core/animation/animatable/AnimatableLengthBoxAndBool.h
+++ b/Source/core/animation/animatable/AnimatableLengthBoxAndBool.h
@@ -38,21 +38,21 @@ namespace blink {
 class AnimatableLengthBoxAndBool final : public AnimatableValue {
 public:
     ~AnimatableLengthBoxAndBool() override { }
-    static PassRefPtrWillBeRawPtr<AnimatableLengthBoxAndBool> create(PassRefPtrWillBeRawPtr<AnimatableValue> box, bool flag)
+    static AnimatableLengthBoxAndBool* create(AnimatableValue* box, bool flag)
     {
-        return adoptRefWillBeNoop(new AnimatableLengthBoxAndBool(box, flag));
+        return new AnimatableLengthBoxAndBool(box, flag);
     }
-    const AnimatableValue* box() const { return m_box.get(); }
+    const AnimatableValue* box() const { return m_box; }
     bool flag() const { return m_flag; }
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
-    PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
+    AnimatableValue* interpolateTo(const AnimatableValue*, double fraction) const override;
     bool usesDefaultInterpolationWith(const AnimatableValue*) const override;
 
 private:
-    AnimatableLengthBoxAndBool(PassRefPtrWillBeRawPtr<AnimatableValue> box, bool flag)
+    AnimatableLengthBoxAndBool(AnimatableValue* box, bool flag)
         : m_box(box)
         , m_flag(flag)
     {
@@ -60,7 +60,7 @@ private:
     AnimatableType type() const override { return TypeLengthBoxAndBool; }
     bool equalTo(const AnimatableValue*) const override;
 
-    RefPtrWillBeMember<AnimatableValue> m_box;
+    Member<AnimatableValue> m_box;
     bool m_flag;
 };