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This reverts commit 55b69ae2.

Reason for revert: Breaking iOS 12 FirstRunTestCase 

Original change's description:
> [iOS] Dismiss unified consent screen from Recent Tabs.
>
> Fixes a bug where the unified consent screen is not dismissed when
> interrupted by a Siri search on the Recent Tabs page.
>
> - Performs complete view controller cleanup on interrupt.
> - Dismisses UnifiedConsentViewController when explicitly required.
> - Does not explicitly release SigninCoordinator in scene controller,
> this is already handled in the completion callback.
>
> Bug: 1115997
> Change-Id: Ib4663fe1136a394020020abc76969761c5e0f170
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600835
> Reviewed-by: Gauthier Ambard <gambard@chromium.org>
> Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#840588}

TBR=gambard@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,fernandex@chromium.org

Change-Id: I09e836432fc7ce4d6091a3cf3795763c12a91fb5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1115997
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612969Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840633}