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This reverts commit 7eab011b.

Reason for revert: AmbientControllerTest failures
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg?limit=200

https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/19204?blamelist=1#blamelist-tab

Original change's description:
> ambient: container logic refactoring [part 1].
> 
> This CL is splitted from the original CL:
> https://chromium-review.googlesource.com/c/chromium/src/+/2199870
> with all files changed on ambient/. side.
> 
> Bug: b/156531168
> Test: unittests.
> Change-Id: I4f84277c74c95419ac96e6cfaaa48081c407b243
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248878
> Commit-Queue: Meilin Wang <meilinw@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#779664}

TBR=xiyuan@chromium.org,xiaohuic@chromium.org,wutao@chromium.org,meilinw@chromium.org

Change-Id: Ia9eaa3e0d856c7dabf2526c3566fa35cf415e17c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/156531168
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250602Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
Commit-Queue: Maxim Kolosovskiy <kolos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779737}