net/http: remove unnecessary parameter type
net/http: remove unnecessary parameter type

Change-Id: I954ca86c142e81c03ec867d10997617d1643b35d
GitHub-Last-Rev: 4ffcc780f16f20ad3a531638d4cef1c7d04da0bc
GitHub-Pull-Request: golang/go#24987
Reviewed-on: https://go-review.googlesource.com/108675
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

josharian/go,golang/go,CAFxX/go,CAFxX/go,nawawi/go,nawawi/go,CAFxX/go,cloudflare/go,josharian/go,josharian/go,akutz/go,akutz/go,akutz/go,cloudflare/go,nawawi/go,golang/go,golang/go,josharian/go,akutz/go,golang/go,cloudflare/go,akutz/go,golang/go,josharian/go,golang/go,CAFxX/go,CAFxX/go,cloudflare/go,CAFxX/go,cloudflare/go,nawawi/go,cloudflare/go,golang/go,josharian/go,nawawi/go,nawawi/go,CAFxX/go,cloudflare/go,josharian/go,CAFxX/go,cloudflare/go,nawawi/go,nawawi/go,akutz/go,golang/go,akutz/go,akutz/go,josharian/go