Revert of Small fix for URLRequestJobs when entering suspending mode.

Revert of Small fix for URLRequestJobs when entering suspending mode. (patchset #3 id:40001 of https://codereview.chromium.org/1366203004/ )

Reason for revert:
Seeing odd failures that make no sense on android bots that may somehow be due to this CL...Trying a revert.  :(

Original issue's description:
> Small fix for URLRequestJobs when entering suspending mode.
>
> When entering suspend mode, there was a window of time between
> when the request was canceled, and when the NetworkDelegate was
> informed it was canceled.  This didn't exist for other cancellation
> paths, and if an embedder invoked certain callbacks in this period,
> thinking the request was still live, crashes could result.
>
> BUG=289715
>
> Committed: https://crrev.com/05608da225e05b4a20da3f4ca0cb9a5276fcf3d6
> Cr-Commit-Position: refs/heads/master@{#350938}

TBR=davidben@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=289715
Committed: https://crrev.com/638a51dd867573876db6b02edd93367c2e51463a
Cr-Commit-Position: refs/heads/master@{#351170}

[mmenke, 2015-09-28 22:07:33]

Created Revert of Small fix for URLRequestJobs when entering suspending mode.

[commit-bot: I haz the power, 2015-09-28 22:08:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1372213003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1372213003/1

[commit-bot: I haz the power, 2015-09-28 22:11:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-28 22:12:04]

Patchset 1 (id:??) landed as
https://crrev.com/638a51dd867573876db6b02edd93367c2e51463a
Cr-Commit-Position: refs/heads/master@{#351170}