Clean up virtual functions in css/

Source/core/css/CSSKeyframeRule.h

Index: Source/core/css/CSSKeyframeRule.h
diff --git a/Source/core/css/CSSKeyframeRule.h b/Source/core/css/CSSKeyframeRule.h
index 0c731295788a25d53300dd374a0a67f93ba5163b..8cde0024fea29be27b5ac62e115eb8ffaff85c73 100644
--- a/Source/core/css/CSSKeyframeRule.h
+++ b/Source/core/css/CSSKeyframeRule.h
@@ -79,7 +79,6 @@ class CSSKeyframeRule final : public CSSRule {
 public:
     virtual ~CSSKeyframeRule();
 
-    virtual CSSRule::Type type() const override { return KEYFRAME_RULE; }
     virtual String cssText() const override { return m_keyframe->cssText(); }
     virtual void reattach(StyleRuleBase*) override;
 
@@ -93,6 +92,8 @@ public:
 private:
     CSSKeyframeRule(StyleKeyframe*, CSSKeyframesRule* parent);
 
+    virtual CSSRule::Type type() const override { return KEYFRAME_RULE; }
+
     RefPtrWillBeMember<StyleKeyframe> m_keyframe;
     mutable RefPtrWillBeMember<StyleRuleCSSStyleDeclaration> m_propertiesCSSOMWrapper;