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

Source/core/animation/animatable/AnimatableDoubleAndBool.h

Index: Source/core/animation/animatable/AnimatableDoubleAndBool.h
diff --git a/Source/core/animation/animatable/AnimatableDoubleAndBool.h b/Source/core/animation/animatable/AnimatableDoubleAndBool.h
index 0dcd73e4913d3dbf18252a91da36c3afd0bf5861..e5681634137800708f5393f6ce5d2c23920c0562 100644
--- a/Source/core/animation/animatable/AnimatableDoubleAndBool.h
+++ b/Source/core/animation/animatable/AnimatableDoubleAndBool.h
@@ -13,9 +13,9 @@ namespace blink {
 class CORE_EXPORT AnimatableDoubleAndBool final : public AnimatableValue {
 public:
     ~AnimatableDoubleAndBool() override { }
-    static PassRefPtrWillBeRawPtr<AnimatableDoubleAndBool> create(double number, bool flag)
+    static AnimatableDoubleAndBool* create(double number, bool flag)
     {
-        return adoptRefWillBeNoop(new AnimatableDoubleAndBool(number, flag));
+        return new AnimatableDoubleAndBool(number, flag);
     }
 
     double toDouble() const { return m_number; }
@@ -24,7 +24,7 @@ public:
     DEFINE_INLINE_VIRTUAL_TRACE() { AnimatableValue::trace(visitor); }
 
 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: