Replace forward class declarations of VisibleSelection to include directive

Source/core/editing/DOMSelection.h

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2012 Google 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.
@@ skipping 15 matching lines @@
  * (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 DOMSelection_h
 #define DOMSelection_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/editing/Position.h"
+#include "core/editing/VisibleSelection.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class ExceptionState;
 class Node;
 class Range;
 class TreeScope;
-class VisibleSelection;
 
 class DOMSelection final : public RefCountedWillBeGarbageCollected<DOMSelection>, public ScriptWrappable, public DOMWindowProperty {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMSelection);
 public:
     static PassRefPtrWillBeRawPtr<DOMSelection> create(const TreeScope* treeScope)
     {
         return adoptRefWillBeNoop(new DOMSelection(treeScope));
     }
 
@@ skipping 51 matching lines @@
     bool isValidForPosition(Node*) const;
 
     void addConsoleError(const String& message);
 
     RawPtrWillBeMember<const TreeScope> m_treeScope;
 };
 
 } // namespace blink
 
 #endif // DOMSelection_h