Oilpan: adjust AnimationTimeline finalization.

Source/core/animation/AnimationPlayer.cpp

Index: Source/core/animation/AnimationPlayer.cpp
diff --git a/Source/core/animation/AnimationPlayer.cpp b/Source/core/animation/AnimationPlayer.cpp
index c08c186868ee450c9e0024c6ef4a6115c7139d77..a9e254463ec914de944d15aa29b9d92a14e05526 100644
--- a/Source/core/animation/AnimationPlayer.cpp
+++ b/Source/core/animation/AnimationPlayer.cpp
@@ -117,6 +117,14 @@ AnimationPlayer::~AnimationPlayer()
     destroyCompositorPlayer();
 }
 
+#if !ENABLE(OILPAN)
+void AnimationPlayer::detachFromTimeline()
+{
+    dispose();
+    m_timeline = nullptr;
+}
+#endif
+
 double AnimationPlayer::sourceEnd() const
 {
     return m_content ? m_content->endTimeInternal() : 0;