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GsfExtrapolator : Move the last method to using unique_ptr / cleanup

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:GSFExtrapolator_unique_ptr into master

The GsfExtrapolator methods were returning std::unique_ptr<MultiComponentState> bar the const MultiComponentState* extrapolateFromLayerToLayer

  • Change the above also.
  • Since all methods in the package (at least the ones I can see ) take in const MultiComponentState& and return `std::unique_ptr`` there is no real case for returning the input.
  • Error is signaled in all I can see with returning nullptr

Mentioning @amorley

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