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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

Review-Url: https://codereview.chromium.org/2044643003
Cr-Commit-Position: refs/heads/master@{#398185}