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This reverts commit dee92446.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 594509 as the
culprit for flakes in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vZGVlOTI0NDZmNzhhYzcwMzYxZGU1OWFlMjI0OTM5YmU4ZjgyMzk4Zgw

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.win/Win%207%20Tests%20x64%20%281%29/43524

Sample Failed Step: network_service_browser_tests

Sample Flaky Test: WebRequestUnresponsiveListenerTest.WebRequestListenerNeverResponds/0

Original change's description:
> [Extensions] Add a test for webRequestBlocking listeners that are killed
> 
> Add a test that exercises behavior for a webRequestBlocking listener
> that never returns, and then the tab is closed. Do this with two
> flavors:
> - A listener in the extension's background page, where the
>   RenderProcessHost is shutdown.
> - A listener in an extension tab, which is then closed.
> 
> Verify that in both cases, navigation is unblocked when the extension
> listener goes away.
> 
> Inspired by, but not in any way a fix for, https://crbug.com/877543.
> 
> Change-Id: Id918d6d5f7bf5d8235f1386ef48838bffaa1b50c
> Reviewed-on: https://chromium-review.googlesource.com/1188942
> Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
> Reviewed-by: Nasko Oskov <nasko@chromium.org>
> Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#594509}

Change-Id: I2c9ebb07e448747ca7f83e51470e1d5e96edc9bd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 889701
Reviewed-on: https://chromium-review.googlesource.com/1247527
Cr-Commit-Position: refs/heads/master@{#594550}