Web Animations: Don't compare start time for AnimationPlayer sorting

Source/core/animation/AnimationPlayer.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 108 matching lines @@
 
     bool canStartAnimationOnCompositor();
     bool maybeStartAnimationOnCompositor();
     void cancelAnimationOnCompositor();
     void schedulePendingAnimationOnCompositor();
     bool hasActiveAnimationsOnCompositor();
 
     class SortInfo {
     public:
         friend class AnimationPlayer;
-        bool operator<(const SortInfo& other) const;
-        double startTime() const { return m_startTime; }
-        bool hasLowerSequenceNumber(const SortInfo& other) const
+        bool operator<(const SortInfo& other) const
         {
             return m_sequenceNumber < other.m_sequenceNumber;
         }
     private:
-        SortInfo(unsigned sequenceNumber, double startTime)
+        SortInfo(unsigned sequenceNumber)
             : m_sequenceNumber(sequenceNumber)
-            , m_startTime(startTime)
         {
         }
         unsigned m_sequenceNumber;
-        double m_startTime;
     };
 
     const SortInfo& sortInfo() const { return m_sortInfo; }
 
     static bool hasLowerPriority(AnimationPlayer* player1, AnimationPlayer* player2)
     {
         return player1->sortInfo() < player2->sortInfo();
     }
 
 #if !ENABLE(OILPAN)
@@ skipping 36 matching lines @@
     bool m_finished;
     // Holds a 'finished' event queued for asynchronous dispatch via the
     // ScriptedAnimationController. This object remains active until the
     // event is actually dispatched.
     RefPtrWillBeMember<Event> m_pendingFinishedEvent;
 };
 
 } // namespace
 
 #endif