[Nit] Removing FIXME comment in CSSAnimations.h

Source/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 186 matching lines @@
 
     const AtomicString getAnimationNameForInspector(const AnimationPlayer&);
 
     // FIXME: This method is only used here and in the legacy animations
     // implementation. It should be made private or file-scope when the legacy
     // engine is removed.
     static const StyleRuleKeyframes* matchScopedKeyframesRule(StyleResolver*, const Element*, const StringImpl*);
 
     static const StylePropertyShorthand& animatableProperties();
     static bool isAllowedAnimation(CSSPropertyID);
-    // FIXME: We should change the Element* to a const Element*
     static PassOwnPtrWillBeRawPtr<CSSAnimationUpdate> calculateUpdate(const Element* animatingElement, Element&, const RenderStyle&, RenderStyle* parentStyle, StyleResolver*);
 
     void setPendingUpdate(PassOwnPtrWillBeRawPtr<CSSAnimationUpdate> update) { m_pendingUpdate = update; }
     void maybeApplyPendingUpdate(Element*);
     bool isEmpty() const { return m_animations.isEmpty() && m_transitions.isEmpty() && !m_pendingUpdate; }
     void cancel();
 
     void trace(Visitor*);
 
 private:
@@ skipping 68 matching lines @@
         AnimationNode::Phase m_previousPhase;
     };
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::NewAnimation);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::UpdatedAnimationTiming);
 
 #endif