[Editing][CodeHealth] Extract new FrameCaret class from FrameSelection

third_party/WebKit/Source/core/editing/DragCaretController.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DragCaretController_h
 #define DragCaretController_h
 
 #include "core/editing/CaretBase.h"
 
-#include <memory>
-
 namespace blink {
 
 class DragCaretController final : public GarbageCollectedFinalized<DragCaretController> {
     WTF_MAKE_NONCOPYABLE(DragCaretController);
 public:
     static DragCaretController* create();
 
     LayoutBlock* caretLayoutObject() const;
     void paintDragCaret(LocalFrame*, GraphicsContext&, const LayoutPoint&) const;
 
     bool isContentEditable() const;
     bool isContentRichlyEditable() const;
 
     bool hasCaret() const { return m_position.isNotNull(); }
     const VisiblePosition& caretPosition() { return m_position; }
     void setCaretPosition(const PositionWithAffinity&);
     void clear() { setCaretPosition(PositionWithAffinity()); }
 
     void nodeWillBeRemoved(Node&);
 
     DECLARE_TRACE();
 
 private:
     DragCaretController();
 
     VisiblePosition m_position;
-    const std::unique_ptr<CaretBase> m_caretBase;
+    const Member<CaretBase> m_caretBase;
 };
 
 } // namespace blink
 
 #endif // DragCaretController_h