Delete some dead code from RRefMessageBase (#64298)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64298
cc pietern mrshenli pritamdamania87 zhaojuanmao satgera rohan-varma gqchen aazzolini osalpekar jiayisuse agolynski SciPioneer H-Huang mrzzd cbalioglu gcramer23
Test Plan: Imported from OSS
Reviewed By: rohan-varma
Differential Revision: D30676702
Pulled By: pbelevich
fbshipit-source-id: 77dbc0f8064c3518376454ff573d45ed0274956b
