Drop [TypeChecking=Nullable]; deduce from attribute type instead

Source/core/animation/AnimationNode.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 84 matching lines @@
     double activeDuration() const { return activeDurationInternal() * 1000; }
     double activeDurationInternal() const;
     double timeFraction() const { return ensureCalculated().timeFraction; }
     double startTime() const { return m_startTime * 1000; }
     double startTimeInternal() const { return m_startTime; }
     double endTime() const { return endTimeInternal() * 1000; }
     double endTimeInternal() const { return startTime() + specifiedTiming().startDelay + activeDurationInternal() + specifiedTiming().endDelay; }
 
     const AnimationPlayer* player() const { return m_player; }
     AnimationPlayer* player() { return m_player; }
-    AnimationPlayer* player(bool& isNull) { isNull = !m_player; return m_player; }
     const Timing& specifiedTiming() const { return m_timing; }
     PassRefPtrWillBeRawPtr<AnimationNodeTiming> timing();
     void updateSpecifiedTiming(const Timing&);
 
     // This method returns time in ms as it is unused except via the API.
     double localTime(bool& isNull) const { isNull = !m_player; return ensureCalculated().localTime * 1000; }
     double currentIteration(bool& isNull) const { isNull = !ensureCalculated().isInEffect; return ensureCalculated().currentIteration; }
 
     virtual void trace(Visitor*);
 
@@ skipping 46 matching lines @@
     } m_calculated;
     mutable bool m_needsUpdate;
     mutable double m_lastUpdateTime;
 
     const CalculatedTiming& ensureCalculated() const;
 };
 
 } // namespace WebCore
 
 #endif