Web Animations: Remove legacy animations engine.

Source/core/frame/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 15 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CSSPropertyAnimation_h
 #define CSSPropertyAnimation_h
 
 #include "CSSPropertyNames.h"
 
 namespace WebCore {
 
-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 bool propertiesEqual(CSSPropertyID, const RenderStyle*, const RenderStyle*);
 
-    // 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