Remove even more @keyframes related code.

sky/engine/core/css/RuleSet.h

Index: sky/engine/core/css/RuleSet.h
diff --git a/sky/engine/core/css/RuleSet.h b/sky/engine/core/css/RuleSet.h
index 425fafb8e2a0a83af8c1ef9f6521c0e69893d301..f4fb9a79908a8df12c453451bd7380547c2f4cec 100644
--- a/sky/engine/core/css/RuleSet.h
+++ b/sky/engine/core/css/RuleSet.h
@@ -24,7 +24,6 @@
 
 #include "sky/engine/core/css/RuleFeature.h"
 #include "sky/engine/core/css/StyleRule.h"
-#include "sky/engine/core/css/StyleRuleKeyframes.h"
 #include "sky/engine/platform/heap/Handle.h"
 #include "sky/engine/wtf/Forward.h"
 #include "sky/engine/wtf/HashMap.h"
@@ -106,7 +105,6 @@ private:
 
     void addToRuleSet(const AtomicString& key, PendingRuleMap&, const RuleData&);
     void addFontFaceRule(StyleRuleFontFace*);
-    void addKeyframesRule(StyleRuleKeyframes*);
 
     void addChildRules(const Vector<RefPtr<StyleRuleBase> >&);
     bool findBestRuleSetAndAdd(const CSSSelector&, RuleData&);