ISF_Fatras: remove unused classes

Simulation/ISF/ISF_Fatras/ISF_FatrasInterfaces/ISF_FatrasInterfaces/IMultipleScatteringSampler.h

-/*
-  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
-*/
-
-///////////////////////////////////////////////////////////////////
-// IMultipleScatteringSampler.h, (c) ATLAS Detector software
-///////////////////////////////////////////////////////////////////
-
-#ifndef ISF_FATRASINTERFACES_IMULTIPLESCATTERINGSAMPLER_H
-#define ISF_FATRASINTERFACES_IMULTIPLESCATTERINGSAMPLER_H
-
-// Gaudi 
-#include "GaudiKernel/IAlgTool.h"
-
-// Trk
-#include "TrkEventPrimitives/ParticleHypothesis.h"
-#include "CxxUtils/checker_macros.h"
-
-namespace Trk {
-  class MaterialProperties;
-}
-
-namespace iFatras {
- 
-  /**@class IMultipleScatteringSampler
-     
-     Interface class IMultipleScatteringSampler
-     
-     @author Noemi.Calace@cern.ch, Andreas.Salzburger@cern.ch
-  */
-  
-  // deprecated: ATLASSIM-6020
-  class ATLAS_NOT_THREAD_SAFE IMultipleScatteringSampler : virtual public IAlgTool {
-
-  public:
-    /**Virtual destructor*/
-    virtual ~IMultipleScatteringSampler(){}
-    
-    /// Creates the InterfaceID and interfaceID() method
-    DeclareInterfaceID(IMultipleScatteringSampler, 1, 0);
-    
-    virtual double simTheta (const Trk::MaterialProperties& mat,
-			     double momentum,
-			     double pathcorrection,
-			     Trk::ParticleHypothesis particle = Trk::pion,
-			     double deltaE=0.) const = 0;
-    
-  };
-
-}
-
-#endif // ISF_FATRASINTERFACES_IMULTIPLESCATTERINGSAMPLER_H