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This reverts commit 5e5acdd4.

Reason for revert: Some corner cases need to be handled.

Bug: b/175398984

Original change's description:
> ambient: Handle key press exit path
>
> Currently ambient mode container does not have focus. A key press will
> enter into the login pod.
> To be consistent with other platforms, the key press is consumed in
> ambient mode by making the ambient mode container activatable.
>
> Bug: b/173642446
> Test: new unittest
> Change-Id: I2331079635834972e292076e55bec54dffe6f507
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577923
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Commit-Queue: Tao Wu <wutao@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#835380}

TBR=xiyuan@chromium.org,xiaohuic@chromium.org,wutao@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

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

Bug: b/173642446
Change-Id: I1789704605085aece066ad65d87241594d222619
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593746
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837320}