Revert "Fix protocol close test"

This reverts commit 92c1ce57a6.

protocol/protocol_test.go

@@ -5,7 +5,6 @@ import (
 	"io"
 	"testing"
 	"testing/quick"
-	"time"
 )
 
 func TestHeaderFunctions(t *testing.T) {
@@ -173,13 +172,7 @@ func TestClose(t *testing.T) {
 	c0 := NewConnection("c0", ar, bw, m0).(wireFormatConnection).next.(*rawConnection)
 	NewConnection("c1", br, aw, m1)
 
-	c0.close <- nil
-
-	select {
-	case <-c0.closed:
-	case <-time.After(1 * time.Second):
-		t.Fatal("Did not close within a second")
-	}
+	c0.close(nil)
 
 	if !c0.isClosed() {
 		t.Fatal("Connection should be closed")