Simplify animation testing API

Source/core/page/animation/CSSPropertyAnimation.h

 /*
  * Copyright (C) 2007 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer. 
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 27 matching lines @@
 class AnimationBase;
 class RenderStyle;
 
 class CSSPropertyAnimation {
 public:
     static bool animationOfPropertyIsAccelerated(CSSPropertyID);
     static bool propertiesEqual(CSSPropertyID, const RenderStyle* a, const RenderStyle* b);
     static CSSPropertyID getPropertyAtIndex(int, bool& isShorthand);
     static int getNumProperties();
 
-    static HashSet<CSSPropertyID> animatableShorthandsAffectingProperty(CSSPropertyID);
-
     // Return true if we need to start software animation timers
     static bool blendProperties(const AnimationBase*, CSSPropertyID, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress);
 private:
     static void ensurePropertyMap();
 };
 
 } // namespace WebCore
 
 #endif // CSSPropertyAnimation_h