Auto merge of #2648 - frewsxcv:unused-to-url, r=alexcrichton
Auto merge of #2648 - frewsxcv:unused-to-url, r=alexcrichton

Remove unused `ToUrl` impls.

None

durka/cargo,vojtechkral/cargo,nipunn1313/cargo,mark-buer/cargo,vojtechkral/cargo,rust-lang/cargo,rust-lang/cargo,AndiDog/cargo,nipunn1313/cargo,tshepang/cargo,tsurai/cargo,tshepang/cargo,durka/cargo,nipunn1313/cargo,tsurai/cargo,achanda/cargo,sbeckeriv/cargo,eminence/cargo,sbeckeriv/cargo,brson/cargo,AndiDog/cargo,tshepang/cargo,tsurai/cargo,achanda/cargo,eminence/cargo,mark-buer/cargo,mark-buer/cargo,AndiDog/cargo,mark-buer/cargo,durka/cargo,rust-lang/cargo,durka/cargo,tsurai/cargo,tshepang/cargo,achanda/cargo,rustyhorde/cargo,brson/cargo,AndiDog/cargo,achanda/cargo,brson/cargo,rustyhorde/cargo,nipunn1313/cargo,sbeckeriv/cargo,tsurai/cargo,eminence/cargo,brson/cargo,rust-lang/cargo,brson/cargo,rustyhorde/cargo,sbeckeriv/cargo,AndiDog/cargo,eminence/cargo,vojtechkral/cargo,mark-buer/cargo,vojtechkral/cargo,rustyhorde/cargo