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

Source/core/animation/AnimationEffectTiming.h

Index: Source/core/animation/AnimationEffectTiming.h
diff --git a/Source/core/animation/AnimationEffectTiming.h b/Source/core/animation/AnimationEffectTiming.h
index 58e272e84b2a284482228a61e0af11c0dfcbe3e3..11112e21122486940f4f0f78e9119937626349ea 100644
--- a/Source/core/animation/AnimationEffectTiming.h
+++ b/Source/core/animation/AnimationEffectTiming.h
@@ -15,10 +15,10 @@ namespace blink {
 
 class UnrestrictedDoubleOrString;
 
-class CORE_EXPORT AnimationEffectTiming : public RefCountedWillBeGarbageCollectedFinalized<AnimationEffectTiming>, public ScriptWrappable {
+class CORE_EXPORT AnimationEffectTiming : public GarbageCollectedFinalized<AnimationEffectTiming>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PassRefPtrWillBeRawPtr<AnimationEffectTiming> create(AnimationEffect* parent);
+    static AnimationEffectTiming* create(AnimationEffect* parent);
     double delay();
     double endDelay();
     String fill();
@@ -42,7 +42,7 @@ public:
     DECLARE_TRACE();
 
 private:
-    RefPtrWillBeMember<AnimationEffect> m_parent;
+    Member<AnimationEffect> m_parent;
     explicit AnimationEffectTiming(AnimationEffect*);
 };