Oilpan: move editing objects to the heap.

Source/core/editing/InsertListCommand.h

Index: Source/core/editing/InsertListCommand.h
diff --git a/Source/core/editing/InsertListCommand.h b/Source/core/editing/InsertListCommand.h
index 599b8daa501229b185a99a503add481daf31a4c3..23f1f9c13acac0550156a388555235a15e037678 100644
--- a/Source/core/editing/InsertListCommand.h
+++ b/Source/core/editing/InsertListCommand.h
@@ -36,13 +36,15 @@ class InsertListCommand FINAL : public CompositeEditCommand {
 public:
     enum Type { OrderedList, UnorderedList };
 
-    static PassRefPtr<InsertListCommand> create(Document& document, Type listType)
+    static PassRefPtrWillBeRawPtr<InsertListCommand> create(Document& document, Type listType)
     {
-        return adoptRef(new InsertListCommand(document, listType));
+        return adoptRefWillBeNoop(new InsertListCommand(document, listType));
     }
 
     virtual bool preservesTypingStyle() const OVERRIDE { return true; }
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 private:
     InsertListCommand(Document&, Type);
 
@@ -55,7 +57,8 @@ private:
     void doApplyForSingleParagraph(bool forceCreateList, const QualifiedName&, Range& currentSelection);
     void unlistifyParagraph(const VisiblePosition& originalStart, HTMLElement* listNode, Node* listChildNode);
     PassRefPtrWillBeRawPtr<HTMLElement> listifyParagraph(const VisiblePosition& originalStart, const QualifiedName& listTag);
-    RefPtrWillBePersistent<HTMLElement> m_listElement;
+
+    RefPtrWillBeMember<HTMLElement> m_listElement;
     Type m_type;
 };