[release-branch.go1.13] net/http: deflake TestCancelRequestWithChannelBeforeDo_Cancel
Goroutines clean up takes longer when using deprecated CloseNotifier.
For #35122.
Fixes #37892.
Change-Id: Id820a3012b5c781ddfb294b38ee3b009624e398c
Reviewed-on: https://go-review.googlesource.com/c/go/+/204661
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit
1e4a358454987ef5104e45081c8e2ecdc9f32513)
Reviewed-on: https://go-review.googlesource.com/c/go/+/223699
Run-TryBot: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>