Make DragCaretController store PositionWithAffinity instead of VisiblePosition

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 25 matching lines @@
 
  public:
   static DragCaretController* create();
 
   void paintDragCaret(LocalFrame*, GraphicsContext&, const LayoutPoint&) const;
 
   bool hasCaretIn(const LayoutBlock&) const;
   bool isContentRichlyEditable() const;
 
   bool hasCaret() const { return m_position.isNotNull(); }
-  const VisiblePosition& caretPosition() { return m_position; }
+  const PositionWithAffinity& caretPosition() { return m_position; }
   void setCaretPosition(const PositionWithAffinity&);
   void clear() { setCaretPosition(PositionWithAffinity()); }
 
   void nodeWillBeRemoved(Node&);
 
   DECLARE_TRACE();
 
  private:
   DragCaretController();
 
-  VisiblePosition m_position;
+  PositionWithAffinity m_position;
   const Member<CaretBase> m_caretBase;
 };
 
 }  // namespace blink
 
 #endif  // DragCaretController_h