Devirtualize several inspector classes destructors

Source/core/inspector/InspectorHistory.h

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 45 matching lines @@
 
         virtual bool undo(ExceptionState&) = 0;
         virtual bool redo(ExceptionState&) = 0;
 
         virtual bool isUndoableStateMark();
     private:
         String m_name;
     };
 
     InspectorHistory();
-    virtual ~InspectorHistory();
 
     bool perform(PassOwnPtr<Action>, ExceptionState&);
     void markUndoableState();
 
     bool undo(ExceptionState&);
     bool redo(ExceptionState&);
     void reset();
 
 private:
     Vector<OwnPtr<Action> > m_history;
     size_t m_afterLastActionIndex;
 };
 
 
 } // namespace WebCore
 
 #endif // !defined(InspectorHistory_h)