Oilpan: move editing objects to the heap.

Source/core/editing/ApplyBlockElementCommand.h

Index: Source/core/editing/ApplyBlockElementCommand.h
diff --git a/Source/core/editing/ApplyBlockElementCommand.h b/Source/core/editing/ApplyBlockElementCommand.h
index d8c6fd6c793c4d25fd73034ec7c4a5f7fcba4e9d..531dc1bd76bb58923242b179974e4345798719ce 100644
--- a/Source/core/editing/ApplyBlockElementCommand.h
+++ b/Source/core/editing/ApplyBlockElementCommand.h
@@ -42,12 +42,14 @@ protected:
     ApplyBlockElementCommand(Document&, const QualifiedName& tagName);
 
     virtual void formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection);
-    PassRefPtr<Element> createBlockElement() const;
+    PassRefPtrWillBeRawPtr<Element> createBlockElement() const;
     const QualifiedName tagName() const { return m_tagName; }
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 private:
     virtual void doApply() OVERRIDE FINAL;
-    virtual void formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtr<Element>&) = 0;
+    virtual void formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtrWillBeRawPtr<Element>&) = 0;
     void rangeForParagraphSplittingTextNodesIfNeeded(const VisiblePosition&, Position&, Position&);
     VisiblePosition endOfNextParagrahSplittingTextNodesIfNeeded(VisiblePosition&, Position&, Position&);