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This reverts commit 6d681c88.

Reason for revert: Causing test failures on MSAN builds:

https://ci.chromium.org/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/21346

Original change's description:
> ambient: support multiple displays
>
> Run ambient mode UI on each connected display.
> RootWindowController construction handles adding ambient widgets
> to new displays while ambient mode is running, and destructing them
> on display removed.
>
> BUG=b:139953389
>
> Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
> Change-Id: Ic57c33491098b66c7c0e90ef1f3d12c71f1fc303
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2516968
> Commit-Queue: Jeffrey Young <cowmoo@chromium.org>
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: Tao Wu <wutao@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#828329}

TBR=oshima@chromium.org,xiaohuic@chromium.org,wutao@chromium.org,cowmoo@chromium.org

Change-Id: I255333ed722549fdc9d0e945c65cf3f742b1cabc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b:139953389
Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545752Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828486}