[easy][PyTorch][CleanUp] Removing unused function def (missing function implementation) (#73019)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73019
fb: Code search shows no usage https://www.internalfb.com/code/search?q=repo%3Aall%20writeMobileMetadata&hide_uninteresting=0&hide_tests=0
ghstack-source-id: 149381949
Test Plan: CI
Reviewed By: larryliu0820
Differential Revision: D34306823
fbshipit-source-id: b405e5683113bd4ff2e89eec023ae9ebb25c3dc9
(cherry picked from commit a72621fbbdc54566365fa522906970f7f06c9af2)
