Fix unused import #1850

Job	Run time
Docs	33s
build_versions (stable)	32s
build_versions (beta)	40s
Test	42s
cargo-deny (aarch64-apple-ios)	19s
build_versions (1.61.0)	20s
Test (json)	50s
Lint	29s
cargo-deny (aarch64-linux-android)	22s
Test (charset)	48s
cargo-deny (i686-pc-windows-gnu)	17s
Test (cookies)	49s
Test (socks-proxy)	42s
cargo-deny (i686-pc-windows-msvc)	19s
Test (native-certs)	43s
cargo-deny (i686-unknown-linux-gnu)	22s
Test (gzip)	1m 1s
cargo-deny (wasm32-unknown-unknown)	25s
Test (brotli)	51s
cargo-deny (x86_64-apple-darwin)	24s
Test (http-crate)	44s
cargo-deny (x86_64-apple-ios)	21s
Test (http-interop)	38s
cargo-deny (x86_64-pc-windows-gnu)	23s
cargo-deny (x86_64-pc-windows-msvc)	17s
cargo-deny (x86_64-unknown-linux-gnu)	19s
cargo-deny (x86_64-unknown-redox)	25s
Test (http-crate http-interop)	1m 38s
Test (tls)	46s
Test (tls, json)	48s
Test (tls, charset)	50s
Test (tls, cookies)	50s
Test (tls, socks-proxy)	47s
Test (tls, native-certs)	1m 7s
Test (tls, gzip)	48s
Test (tls, brotli)	53s
Test (tls, http-crate)	50s
Test (tls, http-interop)	1m 1s
Test (tls, http-crate http-interop)	2m 7s
Test (native-tls)	44s
Test (native-tls, json)	50s
Test (native-tls, charset)	49s
Test (native-tls, cookies)	50s
Test (native-tls, socks-proxy)	51s
Test (native-tls, native-certs)	47s
Test (native-tls, gzip)	52s
Test (native-tls, brotli)	50s
Test (native-tls, http-crate)	1m 42s
Test (native-tls, http-interop)	1m 5s
Test (native-tls, http-crate http-interop)	56s
	37m 16s

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