Remove lots of @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 077671d2e7933d84b61e67e84c2f2ab359f912c5..425fafb8e2a0a83af8c1ef9f6521c0e69893d301 100644
--- a/sky/engine/core/css/RuleSet.h
+++ b/sky/engine/core/css/RuleSet.h
@@ -83,7 +83,6 @@ public:
     const Vector<RuleData>* universalRules() const { ASSERT(!m_pendingRules); return &m_universalRules; }
     const Vector<RuleData>* hostRules() const { ASSERT(!m_pendingRules); return &m_hostRules; }
     const Vector<RawPtr<StyleRuleFontFace> >& fontFaceRules() const { return m_fontFaceRules; }
-    const Vector<RawPtr<StyleRuleKeyframes> >& keyframesRules() const { return m_keyframesRules; }
 
     void compactRulesIfNeeded()
     {
@@ -140,7 +139,6 @@ private:
     Vector<RuleData> m_universalRules;
     Vector<RuleData> m_hostRules;
     Vector<RawPtr<StyleRuleFontFace> > m_fontFaceRules;
-    Vector<RawPtr<StyleRuleKeyframes> > m_keyframesRules;
 
     RuleFeatureSet m_features;