Remove more oilpan.

sky/engine/core/rendering/RenderObjectChildList.h

Index: sky/engine/core/rendering/RenderObjectChildList.h
diff --git a/sky/engine/core/rendering/RenderObjectChildList.h b/sky/engine/core/rendering/RenderObjectChildList.h
index 3fd1b9cd5716bb904d0eada15aeff23b1e8c2eba..33e9a9823e73227021d67d375b8c65df47616dd1 100644
--- a/sky/engine/core/rendering/RenderObjectChildList.h
+++ b/sky/engine/core/rendering/RenderObjectChildList.h
@@ -41,10 +41,9 @@ public:
         , m_lastChild(nullptr)
     {
     }
-    void trace(Visitor*);
 
-    RenderObject* firstChild() const { return m_firstChild.get(); }
-    RenderObject* lastChild() const { return m_lastChild.get(); }
+    RenderObject* firstChild() const { return m_firstChild; }
+    RenderObject* lastChild() const { return m_lastChild; }
 
     // FIXME: Temporary while RenderBox still exists. Eventually this will just happen during insert/append/remove methods on the child list, and nobody
     // will need to manipulate firstChild or lastChild directly.
@@ -61,8 +60,8 @@ public:
     }
 
 private:
-    RawPtr<RenderObject> m_firstChild;
-    RawPtr<RenderObject> m_lastChild;
+    RenderObject* m_firstChild;
+    RenderObject* m_lastChild;
 };
 
 } // namespace blink