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

Source/core/animation/AnimationNode.cpp

Index: Source/core/animation/AnimationNode.cpp
diff --git a/Source/core/animation/AnimationNode.cpp b/Source/core/animation/AnimationNode.cpp
index 630a716a3a06b664eea65cad1946c2440e76b3c2..1043ca444c2b4826256dc020aa539dd6fc44243a 100644
--- a/Source/core/animation/AnimationNode.cpp
+++ b/Source/core/animation/AnimationNode.cpp
@@ -51,7 +51,7 @@ Timing::FillMode resolvedFillMode(Timing::FillMode fillMode, bool isAnimation)
 
 } // namespace
 
-AnimationNode::AnimationNode(const Timing& timing, PassOwnPtrWillBeRawPtr<EventDelegate> eventDelegate)
+AnimationNode::AnimationNode(const Timing& timing, EventDelegate* eventDelegate)
     : m_parent(nullptr)
     , m_startTime(0)
     , m_player(nullptr)
@@ -221,7 +221,7 @@ const AnimationNode::CalculatedTiming& AnimationNode::ensureCalculated() const
     return m_calculated;
 }
 
-PassRefPtrWillBeRawPtr<AnimationNodeTiming> AnimationNode::timing()
+AnimationNodeTiming* AnimationNode::timing()
 {
     return AnimationNodeTiming::create(this);
 }