Remove even more @keyframes related code.

sky/engine/core/animation/css/CSSAnimations.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 29 matching lines @@
 #include "sky/engine/core/rendering/style/RenderStyleConstants.h"
 #include "sky/engine/wtf/HashMap.h"
 #include "sky/engine/wtf/Vector.h"
 #include "sky/engine/wtf/text/AtomicString.h"
 
 namespace blink {
 
 class CSSTransitionData;
 class Element;
 class StylePropertyShorthand;
-class StyleRuleKeyframes;
 
 // This class stores the CSS Animations/Transitions information we use during a style recalc.
 // This includes updates to animations/transitions as well as the Interpolations to be applied.
 class CSSAnimationUpdate final {
 public:
     void startAnimation(AtomicString& animationName, PassRefPtr<InertAnimation> animation)
     {
         NewAnimation newAnimation;
         newAnimation.name = animationName;
         newAnimation.animation = animation;
@@ skipping 158 matching lines @@
         const CSSPropertyID m_property;
         AnimationNode::Phase m_previousPhase;
     };
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::NewAnimation);
 
 #endif  // SKY_ENGINE_CORE_ANIMATION_CSS_CSSANIMATIONS_H_