Web Animations: Remove AnimationPlayer discarding logic

Source/core/animation/AnimationPlayer.h

Index: Source/core/animation/AnimationPlayer.h
diff --git a/Source/core/animation/AnimationPlayer.h b/Source/core/animation/AnimationPlayer.h
index dc1739552c2365aac6592bf6939849cd1bc1ef09..a5c414a2718332488c7e51b5763c18b7a9cc4789 100644
--- a/Source/core/animation/AnimationPlayer.h
+++ b/Source/core/animation/AnimationPlayer.h
@@ -162,12 +162,6 @@ public:
         return player1->sequenceNumber() < player2->sequenceNumber();
     }
 
-#if !ENABLE(OILPAN)
-    // Checks if the AnimationStack is the last reference holder to the Player.
-    // This won't be needed when AnimationPlayer is moved to Oilpan.
-    bool canFree() const;
-#endif
-
     virtual bool addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture = false) override;
 
     DECLARE_VIRTUAL_TRACE();