Templatize PositionWithAffinity class

Source/core/editing/Caret.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 18 matching lines @@
 #include "core/CoreExport.h"
 #include "core/editing/VisiblePosition.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutRect.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class LocalFrame;
 class GraphicsContext;
-class PositionWithAffinity;
 class LayoutBlock;
 class LayoutView;
 
 class CORE_EXPORT CaretBase {
     WTF_MAKE_NONCOPYABLE(CaretBase);
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(CaretBase);
 protected:
     enum CaretVisibility { Visible, Hidden };
     explicit CaretBase(CaretVisibility = Hidden);
 
@@ skipping 48 matching lines @@
 private:
     DragCaretController();
 
     VisiblePosition m_position;
 };
 
 } // namespace blink
 
 
 #endif // Caret_h