Web Animations: Address some review feedback to clean up CSS Animations

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 34 matching lines @@
 namespace WebCore {
 
 class CSSAnimationDataList;
 class Element;
 class RenderObject;
 class StyleResolver;
 
 class CSSAnimationUpdate FINAL {
 public:
     const StylePropertySet* styles() const { return m_styles.get(); }
+    // Returns whether player has been cancelled and should be filtered during style application.
     bool isFiltered(const Player* player) const { return m_filtered.contains(player); }
     void cancel(const Player* player)
     {
         m_filtered.add(player);
     }
     void addStyles(const StylePropertySet* styles)
     {
         if (!m_styles)
             m_styles = MutableStylePropertySet::create();
         m_styles->mergeAndOverrideOnConflict(styles);
@@ skipping 11 matching lines @@
     bool isEmpty() const { return m_animations.isEmpty(); }
     void cancel();
 private:
     typedef HashMap<StringImpl*, Player*> AnimationMap;
     AnimationMap m_animations;
 };
 
 } // namespace WebCore
 
 #endif