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This reverts commit 9bc4b728.

Reason for revert: Suspected cause for ChromeSessionManagerTest.OobeNewUser flakiness. see
BUG=1110996

Original change's description:
> cros oobe: Make Gaia screen a part of wizard controller screens
> 
> This CL modifies code in a way that GaiaScreenHandler is owned and
> handled by GaiaScreen.
> 
> TBR=alemate@chromium.org
> 
> Bug: 1079199
> Change-Id: Idea2f8b9a2974007286e9e8562d1bcee0f2df423
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2279800
> Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
> Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#792674}

TBR=antrim@chromium.org,alemate@chromium.org,rsorokin@chromium.org

Change-Id: I7e677d7b35b414b3ef18023a8fc4052c25fec3cf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1079199
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2327314Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792817}