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This reverts commit 660c9cef.

Reason for revert: AmbientContainerViewTest.MouseClickClosesWidgetAndStopsTimer failing deterministically on several linux-chromeos bots. Please see https://crbug.com/1068745 for more information.

Original change's description:
> ambient: Show lockscreen contents on detecting user interaction.
> 
> In ambient mode, when user interacting with the background image by
> mouse or gesture, lock screen contents (login pod and media control
> view) need be shown on top for users to either do re-authentication,
> or media control.
> 
> This CL implements a prototype of this view transaction by:
> 1. Show the lock screen contents, and
> 2. Fade-out the current shown image.
> 
> Bug: b/149246238
> Test: manually.
> Change-Id: Ie31c666cdfaddefc863ff8173dc185d73ef19178
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2110689
> Commit-Queue: Meilin Wang <meilinw@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#757120}

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

Change-Id: I395a7c02c6aa292f66ca5d9b4aefa9156e057773
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/149246238, 1068745
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139369Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757223}