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

Source/core/animation/InertAnimation.h

Index: Source/core/animation/InertAnimation.h
diff --git a/Source/core/animation/InertAnimation.h b/Source/core/animation/InertAnimation.h
index 1b3f80a7b5f78db71712d11e2f4c1f62514c32f8..358c99d80d02b78f68d265d7c812a624535d58b5 100644
--- a/Source/core/animation/InertAnimation.h
+++ b/Source/core/animation/InertAnimation.h
@@ -40,8 +40,8 @@ namespace blink {
 
 class CORE_EXPORT InertAnimation final : public AnimationNode {
 public:
-    static PassRefPtrWillBeRawPtr<InertAnimation> create(PassRefPtrWillBeRawPtr<AnimationEffect>, const Timing&, bool paused, double inheritedTime);
-    void sample(OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation>>>&);
+    static InertAnimation* create(AnimationEffect*, const Timing&, bool paused, double inheritedTime);
+    void sample(HeapVector<Member<Interpolation>>*);
     AnimationEffect* effect() const { return m_effect.get(); }
     bool paused() const { return m_paused; }
 
@@ -52,8 +52,8 @@ protected:
     virtual double calculateTimeToEffectChange(bool forwards, double inheritedTime, double timeToNextIteration) const override;
 
 private:
-    InertAnimation(PassRefPtrWillBeRawPtr<AnimationEffect>, const Timing&, bool paused, double inheritedTime);
-    RefPtrWillBeMember<AnimationEffect> m_effect;
+    InertAnimation(AnimationEffect*, const Timing&, bool paused, double inheritedTime);
+    Member<AnimationEffect> m_effect;
     bool m_paused;
     double m_inheritedTime;
 };