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This reverts commit 29736b94.

Reason for revert: Tests are failing consistently in linux-chromeos-rel

Sample failing jobs:
[1] https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-rel/41574
[2] https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-rel/41572

Tried to reproduce locally, HasMaskLayerWithLongText fails 9 out of 10 times.

Error message: 
../../ash/ambient/ui/media_string_view_unittest.cc:285: Failure
Value of: GetMediaStringViewTextContainer()->layer()->layer_mask_layer()
  Actual: false
Expected: true

Original change's description:
> ambient: handle suspend case better
>
> Previously ambient mode will trigger lockscreen on screen dimm and then
> rely on lock screen idle to show screen saver. This works in some cases,
> but in suspend case the time between screen dim and cpu suspend is too
> short. Screen saver was not able to enguage. The reason we have the set
> up is because the screen saver was sharing the same window constainer as
> the lock screen, it cannot show before lock screen is ready.
>
> Now screen saver has its own window container, we changed the flow to
> show ambient mode immediately when idle. This will prevent cpu suspend
> because screen saver will take a wake lock if charging. Screen saver
> will still lock the screen in the back if user reference indicated
> lockscreen after wake.
>
> Bug: b:169442907
> Test: unitests and manual tests
> Change-Id: I1a5df2c58c976bba492c709e0a61dd5a6314d084
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435334
> Reviewed-by: Tao Wu <wutao@chromium.org>
> Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#812397}

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

Change-Id: I307c11aed04801e6705be083dcaabfa2c5099802
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b:169442907
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440326Reviewed-by: Jiewei Qian  <qjw@chromium.org>
Commit-Queue: Jiewei Qian  <qjw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812549}