net/http: revert fix request canceler leak on connection close

[AlexanderYastrebov]

This reverts CL 515796 due to a flaking test.

Updates #61708
Fixes #62224

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Alexander Yastrebov:

Patch Set 1:

(1 comment)

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This PR (HEAD: 3544648) has been imported to Gerrit for code review.

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[gopherbot]

Message from Bryan Mills:

Patch Set 3: Code-Review+2

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Message from Bryan Mills:

Patch Set 3: Auto-Submit+1 Run-TryBot+1

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Message from Gopher Robot:

Patch Set 3:

(1 comment)

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Message from Dmitri Shuralyov:

Patch Set 3: Code-Review+1

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Message from Than McIntosh:

Patch Set 3: Code-Review+1

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This PR is being closed because golang.org/cl/522097 has been merged.