Remove tons of OILPAN.

sky/engine/core/css/ElementRuleCollector.h

Index: sky/engine/core/css/ElementRuleCollector.h
diff --git a/sky/engine/core/css/ElementRuleCollector.h b/sky/engine/core/css/ElementRuleCollector.h
index 87bf72f5adddf51a85e83a99972ef621c3e650d9..50f75cfacf4c77fae8d77ff17d4f08dbd183f784 100644
--- a/sky/engine/core/css/ElementRuleCollector.h
+++ b/sky/engine/core/css/ElementRuleCollector.h
@@ -62,10 +62,6 @@ public:
     uint32_t cascadeScope() const { return m_cascadeScope; }
     uint64_t position() const { return m_position; }
     const CSSStyleSheet* parentStyleSheet() const { return m_parentStyleSheet; }
-    void trace(Visitor* visitor)
-    {
-        visitor->trace(m_parentStyleSheet);
-    }
 
 private:
     // FIXME: Oilpan: RuleData is in the oilpan heap and this pointer
@@ -89,13 +85,6 @@ class StyleRuleList final : public RefCounted<StyleRuleList> {
 public:
     static PassRefPtr<StyleRuleList> create() { return adoptRef(new StyleRuleList()); }
 
-    void trace(Visitor* visitor)
-    {
-#if ENABLE(OILPAN)
-        visitor->trace(m_list);
-#endif
-    }
-
     Vector<RawPtr<StyleRule> > m_list;
 };