Tests that Marshaling a parsed response returns the same bytes as were parsed. Use Marshal in CreateRequest; still passes CreateRequest's golden test. Change-Id: I427ef8372d7b62c43b7718d7d90631d022377d32 Reviewed-on: https://go-review.googlesource.com/19488 Run-TryBot: Russ Cox <rsc@golang.org> Reviewed-by: Russ Cox <rsc@golang.org>