Clean up virtual functions in css/

Source/core/css/CSSCharsetRule.h

Index: Source/core/css/CSSCharsetRule.h
diff --git a/Source/core/css/CSSCharsetRule.h b/Source/core/css/CSSCharsetRule.h
index 86a0814a0656bffd09ca696fd48fa72188353b14..e6a0425257dc3028b23fe19203b03c6fc03003b5 100644
--- a/Source/core/css/CSSCharsetRule.h
+++ b/Source/core/css/CSSCharsetRule.h
@@ -36,7 +36,6 @@ public:
 
     virtual ~CSSCharsetRule() { }
 
-    virtual CSSRule::Type type() const override { return CHARSET_RULE; }
     virtual String cssText() const override;
     virtual void reattach(StyleRuleBase* rule) override { ASSERT_UNUSED(rule, !rule); }
 
@@ -48,6 +47,8 @@ public:
 private:
     CSSCharsetRule(CSSStyleSheet* parent, const String& encoding);
 
+    virtual CSSRule::Type type() const override { return CHARSET_RULE; }
+
     String m_encoding;
 };