Revert of Web Animations: Use a single animation clock

third_party/WebKit/Source/core/animation/AnimationTimeline.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 54 matching lines @@
     ~AnimationTimeline();
 
     void serviceAnimations(TimingUpdateReason);
     void scheduleNextService();
 
     Animation* play(AnimationEffect*);
     HeapVector<Member<Animation>> getAnimations();
 
     void animationAttached(Animation&);
 
-    bool isActive();
     bool hasPendingUpdates() const { return !m_animationsNeedingUpdate.isEmpty(); }
     double zeroTime();
     double currentTime(bool& isNull);
     double currentTime();
     double currentTimeInternal(bool& isNull);
     double currentTimeInternal();
     void setCurrentTime(double);
     void setCurrentTimeInternal(double);
     double effectiveTime();
     void pauseAnimationsForTesting(double);
@@ skipping 61 matching lines @@
         Member<AnimationTimeline> m_timeline;
         Timer<AnimationTimelineTiming> m_timer;
     };
 
     friend class AnimationAnimationTimelineTest;
 };
 
 } // namespace blink
 
 #endif