This really smells like a duplicate dictionary to that already introduced in #1078. 
Logically, this is the correct place to put this dictionary (I guess the violation wasn't caught by the code checker).
Compare to https://github.com/cms-sw/cmssw/blob/56e32ad092cbbc326aa6ef9d3df4bb3268808a11/DataFormats/ParticleFlowReco/src/classes_def_2.xml#L13
      <class name="std::pair<edm::Ptr<reco::CaloCluster>::key_type,edm::Ptr<reco::CaloCluster> >"/>
So, better update this PR with removal of dictionaries from the DataFormats/ParticleFlowReco