net/http: use reflect.TypeFor for known types

For #60088

Change-Id: I9e4044d9c2694fe86aab1f5220622c8d952b1a90
Reviewed-on: https://go-review.googlesource.com/c/go/+/522338
Reviewed-by: Ian Lance Taylor <[email protected]>
Reviewed-by: Damien Neil <[email protected]>
Run-TryBot: Ian Lance Taylor <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Run-TryBot: Ian Lance Taylor <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>

Author: ianlancetaylor

src/net/http/transfer_test.go

@@ -112,8 +112,8 @@ func (w *mockTransferWriter) Write(p []byte) (int, error) {
 }
 
 func TestTransferWriterWriteBodyReaderTypes(t *testing.T) {
-	fileType := reflect.TypeOf(&os.File{})
-	bufferType := reflect.TypeOf(&bytes.Buffer{})
+	fileType := reflect.TypeFor[*os.File]()
+	bufferType := reflect.TypeFor[*bytes.Buffer]()
 
 	nBytes := int64(1 << 10)
 	newFileFunc := func() (r io.Reader, done func(), err error) {