const google.golang.org/api/googleapi.UserAgent

3 uses

	google.golang.org/api/googleapi (current package)
		googleapi.go#L53: 	UserAgent = "google-api-go-client/" + Version

	google.golang.org/api/storage/v1
		storage-gen.go#L174: 		return googleapi.UserAgent
		storage-gen.go#L176: 	return googleapi.UserAgent + " " + s.UserAgent