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Revert of Add debug information for crbug.com/289715 (patchset #5 id:80001 of https://codereview.chromium.org/810883007/)

Reason for revert:
Remove debugging information that was collected for crbug.com/289715

Original issue's description:
> Add debug information for crbug.com/289715
>
> Add temporary debugging information to determine whether a callback happens
> after the targeted URLRequestHttpJob was already deleted or whether a callback
> happens after its transaction was deleted.
>
> BUG=289715
>
> Committed: https://crrev.com/aec005dce78bc2c2513f4e49343b8baad751a852
> Cr-Commit-Position: refs/heads/master@{#310822}

TBR=mmenke@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=289715

Review URL: https://codereview.chromium.org/907033002

Cr-Commit-Position: refs/heads/master@{#315298}