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This reverts commit 6dbf08b3.

Reason for revert: Compile failure on linux-chromeos-dbg
https://ci.chromium.org/buildbot/chromium.chromiumos/linux-chromeos-dbg/4899

BUG=826101

Original change's description:
> Adds AshAssistantController.
> 
> Bug: b:76028606
> Change-Id: Iafdafed688333035f67067b3f60c9b35c99a8276
> Reviewed-on: https://chromium-review.googlesource.com/973551
> Commit-Queue: David Black <dmblack@google.com>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: Muyuan Li <muyuanli@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#545908}

TBR=xiyuan@chromium.org,dcheng@chromium.org,xiaohuic@chromium.org,dmblack@google.com,muyuanli@chromium.org

Change-Id: Ic33bb5e3efcec6547469999fd42e662529275942
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b:76028606
Reviewed-on: https://chromium-review.googlesource.com/981464Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545918}