internal/requestlog: use http.Get instead of s.Client.Get

Same rationale as golang.org/cl/78539.

Change-Id: I32f0f412b3d31d803b554a0cc5df9265e7405796
Reviewed-on: https://go-review.googlesource.com/78541
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/internal/requestlog/fluentd_test.go b/internal/requestlog/fluentd_test.go
index ac64428..8d696b8 100644
--- a/internal/requestlog/fluentd_test.go
+++ b/internal/requestlog/fluentd_test.go
@@ -195,7 +195,7 @@
 		defer s.Close()
 		b.ReportAllocs()
 		for i := 0; i < b.N; i++ {
-			resp, err := s.Client().Get(s.URL)
+			resp, err := http.Get(s.URL)
 			if err != nil {
 				b.Fatal(err)
 			}