Use HeapHashCountedSet for AnimationPlayerCountedSet

Source/core/animation/Animation.cpp

Index: Source/core/animation/Animation.cpp
diff --git a/Source/core/animation/Animation.cpp b/Source/core/animation/Animation.cpp
index c5c6b45391418be260e504cfd15ad5707a615934..94f7217c6e66aa4989195e08f204e8084fd4edb4 100644
--- a/Source/core/animation/Animation.cpp
+++ b/Source/core/animation/Animation.cpp
@@ -112,7 +112,7 @@ Animation::~Animation()
 void Animation::attach(AnimationPlayer* player)
 {
     if (m_target) {
-        m_target->ensureActiveAnimations().addPlayer(player);
+        m_target->ensureActiveAnimations().players().add(player);
         m_target->setNeedsAnimationStyleRecalc();
     }
     AnimationNode::attach(player);
@@ -121,7 +121,7 @@ void Animation::attach(AnimationPlayer* player)
 void Animation::detach()
 {
     if (m_target)
-        m_target->activeAnimations()->removePlayer(player());
+        m_target->activeAnimations()->players().remove(player());
     if (m_sampledEffect)
         clearEffects();
     AnimationNode::detach();