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

Source/core/animation/css/CSSAnimations.h

Index: Source/core/animation/css/CSSAnimations.h
diff --git a/Source/core/animation/css/CSSAnimations.h b/Source/core/animation/css/CSSAnimations.h
index fbc767dd0fd424140cac3b0d109ff109cd5d9390..d8cc4e729750bdfa72b9aed40338ec54c49a2384 100644
--- a/Source/core/animation/css/CSSAnimations.h
+++ b/Source/core/animation/css/CSSAnimations.h
@@ -72,6 +72,7 @@ public:
     {
         m_pendingUpdate.clear();
     }
+
     void maybeApplyPendingUpdate(Element*);
     bool isEmpty() const { return m_animations.isEmpty() && m_transitions.isEmpty() && m_pendingUpdate.isEmpty(); }
     void cancel();
@@ -79,15 +80,18 @@ public:
     DECLARE_TRACE();
 
 private:
-    class RunningAnimation final : public RefCountedWillBeGarbageCollectedFinalized<RunningAnimation> {
+    class RunningAnimation final : public GarbageCollectedFinalized<RunningAnimation> {
     public:
-        RunningAnimation(PassRefPtrWillBeRawPtr<Animation> animation, CSSAnimationUpdate::NewAnimation newAnimation)
+        RunningAnimation(Animation* animation, CSSAnimationUpdate::NewAnimation newAnimation)
             : animation(animation)
             , specifiedTiming(newAnimation.timing)
             , styleRule(newAnimation.styleRule)
             , styleRuleVersion(newAnimation.styleRuleVersion)
         {
         }
+        ~RunningAnimation()
+        {
+        }
 
         void update(CSSAnimationUpdate::UpdatedAnimation update)
         {
@@ -102,7 +106,7 @@ private:
             visitor->trace(styleRule);
         }
 
-        RefPtrWillBeMember<Animation> animation;
+        Member<Animation> animation;
         Timing specifiedTiming;
         RefPtrWillBeMember<StyleRuleKeyframes> styleRule;
         unsigned styleRuleVersion;
@@ -118,15 +122,15 @@ private:
             visitor->trace(to);
         }
 
-        RefPtrWillBeMember<Animation> animation;
-        RawPtrWillBeMember<const AnimatableValue> from;
-        RawPtrWillBeMember<const AnimatableValue> to;
+        Member<Animation> animation;
+        Member<const AnimatableValue> from;
+        Member<const AnimatableValue> to;
     };
 
-    using AnimationMap = WillBeHeapHashMap<AtomicString, RefPtrWillBeMember<RunningAnimation>>;
+    using AnimationMap = HeapHashMap<AtomicString, Member<RunningAnimation>>;
     AnimationMap m_animations;
 
-    using TransitionMap = WillBeHeapHashMap<CSSPropertyID, RunningTransition>;
+    using TransitionMap = HeapHashMap<CSSPropertyID, RunningTransition>;
     TransitionMap m_transitions;
 
     CSSAnimationUpdate m_pendingUpdate;