http.go: Move helper function nowSeries() to test case

Fixes:
http.go:142:1⚠️ nowSeries is unused (deadcode)

Signed-off-by: Karsten Weiss <knweiss@gmail.com>

prometheus/http.go

@@ -139,16 +139,6 @@ var now nower = nowFunc(func() time.Time {
 	return time.Now()
 })
 
-func nowSeries(t ...time.Time) nower {
-	return nowFunc(func() time.Time {
-		defer func() {
-			t = t[1:]
-		}()
-
-		return t[0]
-	})
-}
-
 // InstrumentHandler wraps the given HTTP handler for instrumentation. It
 // registers four metric collectors (if not already done) and reports HTTP
 // metrics to the (newly or already) registered collectors: http_requests_total

prometheus/http_test.go

@@ -29,6 +29,16 @@ func (b respBody) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	w.Write([]byte(b))
 }
 
+func nowSeries(t ...time.Time) nower {
+	return nowFunc(func() time.Time {
+		defer func() {
+			t = t[1:]
+		}()
+
+		return t[0]
+	})
+}
+
 func TestInstrumentHandler(t *testing.T) {
 	defer func(n nower) {
 		now = n.(nower)