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This reverts commit 09d525a9.

Reason for revert: revert for a clean revert of crrev.com/c/777780

Original change's description:
> mash: convert PlayEarcon/PlayShutdownSound through mojo call
> 
> changes:
> - Remove PlayEarcon/PlayShutdownSound from ash::AccessibilityDelegate.
>   Convert them calling into chrome through mojo call.
> - PlayShutdownSound gets shutdown sound duration asynchronously from
>   chrome in ash::AccessibilityController. Synchronize the real shutdown
>   timer's beginning when getting shutdown sound duration.
> 
> TBR=xiyuan@chromium.org
> 
> work when SpokenFeedbackEnabled is moved to ash. And add several test
> coverage.
> 
> Bug: 618070
> Test: tested on device without --mash, it works fine. --mash should
> Change-Id: I82b3ce684983e3de658e8d165f90a47cf754f4f6
> Reviewed-on: https://chromium-review.googlesource.com/773629
> Commit-Queue: Qiang(Joe) Xu <warx@chromium.org>
> Reviewed-by: Qiang(Joe) Xu <warx@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#520441}

TBR=jamescook@chromium.org,xiyuan@chromium.org,dmazzoni@chromium.org,dtseng@chromium.org,tsepez@chromium.org,warx@chromium.org

Change-Id: I3673182425fa0cb4702036d326b83a275415d5de
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 618070, 790750
Reviewed-on: https://chromium-review.googlesource.com/802614Reviewed-by: Qiang(Joe) Xu <warx@chromium.org>
Commit-Queue: Qiang(Joe) Xu <warx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520780}