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This reverts commit 155c0b00.

Reason for revert: This breaks the lock screen notification.

Original change's description:
> Show notification counter even on lock screen
> 
> - Unblock notifications in SessionStateNotificationBlocker
> - Hide the message center by seeing the session sate (previously, it
>   saw the count of notifications)
> - Change height below scroll, by checking the visibility of message
>   center (previously, it checked only the height)
> 
> Bug: 893945
> Test: manual
> 
> Change-Id: I39d30d0949d0f44078193ab7e4859f66eeebf880
> Reviewed-on: https://chromium-review.googlesource.com/c/1282426
> Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
> Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
> Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#601824}

TBR=yoshiki@chromium.org,yamaguchi@chromium.org,tetsui@chromium.org

Change-Id: I5b2ded9c9f3212ab3cd085a3ea0721e69b6fae45
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 893945
Reviewed-on: https://chromium-review.googlesource.com/c/1296330Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601930}