Remove tons of OILPAN.

sky/engine/core/css/CSSRuleList.h

Index: sky/engine/core/css/CSSRuleList.h
diff --git a/sky/engine/core/css/CSSRuleList.h b/sky/engine/core/css/CSSRuleList.h
index e5da780f6f14a15e81fe23b2f346bcad66c6f3ff..4c3031f8e66034781c5a8150208a90bd516bed3b 100644
--- a/sky/engine/core/css/CSSRuleList.h
+++ b/sky/engine/core/css/CSSRuleList.h
@@ -50,8 +50,6 @@ public:
 
     virtual CSSStyleSheet* styleSheet() const = 0;
 
-    virtual void trace(Visitor*) { }
-
 protected:
     CSSRuleList();
 };
@@ -72,8 +70,6 @@ public:
 
     virtual CSSStyleSheet* styleSheet() const override { return 0; }
 
-    virtual void trace(Visitor*) override;
-
 private:
     StaticCSSRuleList();
     virtual ~StaticCSSRuleList();
@@ -100,12 +96,6 @@ public:
     virtual void deref() override { m_rule->deref(); }
 #endif
 
-    virtual void trace(Visitor* visitor) override
-    {
-        visitor->trace(m_rule);
-        CSSRuleList::trace(visitor);
-    }
-
 private:
     LiveCSSRuleList(Rule* rule) : m_rule(rule) { }