Oilpan: make DocumentFragment a heap allocated object.

Source/core/editing/MoveSelectionCommand.h

 /*
  * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 16 matching lines @@
 #define MoveSelectionCommand_h
 
 #include "core/editing/CompositeEditCommand.h"
 
 namespace WebCore {
 
 class DocumentFragment;
 
 class MoveSelectionCommand FINAL : public CompositeEditCommand {
 public:
-    static PassRefPtr<MoveSelectionCommand> create(PassRefPtr<DocumentFragment> fragment, const Position& position, bool smartInsert = false, bool smartDelete = false)
+    static PassRefPtr<MoveSelectionCommand> create(PassRefPtrWillBeRawPtr<DocumentFragment> fragment, const Position& position, bool smartInsert = false, bool smartDelete = false)
     {
         return adoptRef(new MoveSelectionCommand(fragment, position, smartInsert, smartDelete));
     }
 
 private:
-    MoveSelectionCommand(PassRefPtr<DocumentFragment>, const Position&, bool smartInsert, bool smartDelete);
+    MoveSelectionCommand(PassRefPtrWillBeRawPtr<DocumentFragment>, const Position&, bool smartInsert, bool smartDelete);
 
     virtual void doApply() OVERRIDE;
     virtual EditAction editingAction() const OVERRIDE;
 
-    RefPtr<DocumentFragment> m_fragment;
+    RefPtrWillBePersistent<DocumentFragment> m_fragment;
     Position m_position;
     bool m_smartInsert;
     bool m_smartDelete;
 };
 
 } // namespace WebCore
 
 #endif // MoveSelectionCommand_h