net/http: revert fix request canceler leak on connection close
This reverts CL 515796 due to a flaking test.
Updates #61708
Fixes #62224
Change-Id: I53911a07677d08c3196daaaa2708269593baf472
GitHub-Last-Rev:
3544648ecc3783dcb10d54fc2b266797c02f9a75
GitHub-Pull-Request: golang/go#62233
Reviewed-on: https://go-review.googlesource.com/c/go/+/522097
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>