cmd/go/internal/modfetch/codehost: remove unused GitRepo function

For #37943

Change-Id: Ib8ba5d846f41afc0047c33b8145918d93326cdd0
Reviewed-on: https://go-review.googlesource.com/c/go/+/225937
Run-TryBot: Bryan C. Mills <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Michael Matloob <[email protected]>

Author: Bryan C. Mills

src/cmd/go/internal/modfetch/codehost/git.go

@@ -27,11 +27,6 @@ import (
 	"golang.org/x/mod/semver"
 )
 
-// GitRepo returns the code repository at the given Git remote reference.
-func GitRepo(remote string) (Repo, error) {
-	return newGitRepoCached(remote, false)
-}
-
 // LocalGitRepo is like Repo but accepts both Git remote references
 // and paths to repositories on the local file system.
 func LocalGitRepo(remote string) (Repo, error) {