`sc-chain-spec`: deprecated code removed #792

Job	Run time
check-dependency-rules	10s
check-markdown	16s
check-workspace	16s
set-image	9s
check-rust-feature-propagation	2m 8s
check-toml-format	1m 6s
test-rust-features	2m 9s
fmt	1m 13s
check-umbrella	2m 57s
	10m 24s

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