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This reverts commit 44aa3a7f.

Reason for revert: Causes crbug.com/819999

Original change's description:
> Encapsulate dismissal cleanup within SettingsNavigationController
> 
> Bug: 782943
> Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
> Change-Id: If5ebc06503448526b57f42ea6543b5373efe2c90
> Reviewed-on: https://chromium-review.googlesource.com/826024
> Reviewed-by: Mark Cogan <marq@chromium.org>
> Reviewed-by: edchin <edchin@chromium.org>
> Commit-Queue: Peter Laurens <peterlaurens@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#525372}

TBR=marq@chromium.org,edchin@chromium.org,peterlaurens@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 782943
Change-Id: If7daa3faaa515430e5354c9fe0c4654840094696
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/966961Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543826}