Remove unused matchPlayState argument from CSSAnimationData::animationsMatch()

Source/core/platform/animation/CSSAnimationData.h

Index: Source/core/platform/animation/CSSAnimationData.h
diff --git a/Source/core/platform/animation/CSSAnimationData.h b/Source/core/platform/animation/CSSAnimationData.h
index 49c4bebed6ad73a334d5f4c3df97c267dbf26a80..d0fa147bd52253a7b487afcbb27804ce70dd5e1b 100644
--- a/Source/core/platform/animation/CSSAnimationData.h
+++ b/Source/core/platform/animation/CSSAnimationData.h
@@ -148,7 +148,7 @@ private:
     explicit CSSAnimationData(const CSSAnimationData&);
 
     // return true if all members of this class match (excluding m_next)
-    bool animationsMatch(const CSSAnimationData*, bool matchPlayStates = true) const;
+    bool animationsMatch(const CSSAnimationData*) const;
 
     AtomicString m_name;
     CSSPropertyID m_property;