Revert of Fix event page process cleanup when running in --isolate-extensions mode.

Revert of Fix event page process cleanup when running in --isolate-extensions mode. (patchset #6 id:100001 of https://codereview.chromium.org/2028873002/ )

Reason for revert:
Speculative revert of this CL to check if it is the root cause of https://crbug.com/616989.

Original issue's description:
> Fix event page process cleanup when running in --isolate-extensions mode.
>
> With --isolate-extensions, navigations can start in one RenderFrameHost
> and complete in another. This was not possible to happen with extensions
> related RenderFrameHosts in the past, so the code wasn't able to handle
> it. This CL refactors the OnNetworkRequest(Started|Stopped) to use the
> navigation request id as the stable identifier instead of the associated
> RenderFrameHost.
>
> BUG=612668
>
> Committed: https://crrev.com/c25500369dd9a7f49d2b7d276556b2e22ba840c8
> Cr-Commit-Position: refs/heads/master@{#397328}

TBR=rdevlin.cronin@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=612668
Committed: https://crrev.com/3cae185174cf799005ee4d4f6147e01fad45e354
Cr-Commit-Position: refs/heads/master@{#398185}

[nasko, 2016-06-06 23:42:56]

The CQ bit was checked by nasko@chromium.org

[nasko, 2016-06-06 23:42:57]

Created Revert of Fix event page process cleanup when running in
--isolate-extensions mode.

[commit-bot: I haz the power, 2016-06-06 23:43:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2044643003/1

[commit-bot: I haz the power, 2016-06-07 01:11:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-07 01:16:09]

Description was changed from

==========
Revert of Fix event page process cleanup when running in --isolate-extensions
mode. (patchset #6 id:100001 of https://codereview.chromium.org/2028873002/ )

Reason for revert:
Speculative revert of this CL to check if it is the root cause of
https://crbug.com/616989.

Original issue's description:
> Fix event page process cleanup when running in --isolate-extensions mode.
> 
> With --isolate-extensions, navigations can start in one RenderFrameHost
> and complete in another. This was not possible to happen with extensions
> related RenderFrameHosts in the past, so the code wasn't able to handle
> it. This CL refactors the OnNetworkRequest(Started|Stopped) to use the
> navigation request id as the stable identifier instead of the associated
> RenderFrameHost.
> 
> BUG=612668
> 
> Committed: https://crrev.com/c25500369dd9a7f49d2b7d276556b2e22ba840c8
> Cr-Commit-Position: refs/heads/master@{#397328}

TBR=rdevlin.cronin@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=612668
==========

to

==========
Revert of Fix event page process cleanup when running in --isolate-extensions
mode. (patchset #6 id:100001 of https://codereview.chromium.org/2028873002/ )

Reason for revert:
Speculative revert of this CL to check if it is the root cause of
https://crbug.com/616989.

Original issue's description:
> Fix event page process cleanup when running in --isolate-extensions mode.
>
> With --isolate-extensions, navigations can start in one RenderFrameHost
> and complete in another. This was not possible to happen with extensions
> related RenderFrameHosts in the past, so the code wasn't able to handle
> it. This CL refactors the OnNetworkRequest(Started|Stopped) to use the
> navigation request id as the stable identifier instead of the associated
> RenderFrameHost.
>
> BUG=612668
>
> Committed: https://crrev.com/c25500369dd9a7f49d2b7d276556b2e22ba840c8
> Cr-Commit-Position: refs/heads/master@{#397328}

TBR=rdevlin.cronin@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=612668

Committed: https://crrev.com/3cae185174cf799005ee4d4f6147e01fad45e354
Cr-Commit-Position: refs/heads/master@{#398185}
==========

[commit-bot: I haz the power, 2016-06-07 01:16:10]

Patchset 1 (id:??) landed as
https://crrev.com/3cae185174cf799005ee4d4f6147e01fad45e354
Cr-Commit-Position: refs/heads/master@{#398185}

[nasko, 2016-06-07 20:10:22]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2040293002/ by nasko@chromium.org.

The reason for reverting is: Reverting the revert, as the speculation of this CL
being the root cause did not pan out -
https://bugs.chromium.org/p/chromium/issues/detail?id=616989#c36..