Remove dead example code + dep

[ribasushi]

No description provided.

[codecov]

Codecov Report

Merging #7466 (c4a7de9) into master (1993efe) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7466      +/-   ##
==========================================
- Coverage   39.21%   39.13%   -0.09%     
==========================================
  Files         631      631              
  Lines       66787    66787              
==========================================
- Hits        26191    26137      -54     
- Misses      36024    36072      +48     
- Partials     4572     4578       +6     

Impacted Files	Coverage Δ
journal/types.go	86.66% <0.00%> (-13.34%)	⬇️
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
extern/sector-storage/manager_calltracker.go	57.70% <0.00%> (-4.85%)	⬇️
chain/actors/builtin/paych/paych.go	14.77% <0.00%> (-4.55%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (-4.31%)	⬇️
storage/wdpost_sched.go	77.22% <0.00%> (-3.97%)	⬇️
chain/types/tipset_key.go	85.96% <0.00%> (-3.51%)	⬇️
journal/fsjournal/fs.go	66.66% <0.00%> (-2.78%)	⬇️
chain/store/store.go	63.50% <0.00%> (-2.00%)	⬇️
extern/storage-sealing/fsm.go	55.77% <0.00%> (-1.20%)	⬇️
... and 11 more

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